CN209514059U - Ping-pong structure peak holding and automatic discharge circuit based on simulation control - Google Patents
Ping-pong structure peak holding and automatic discharge circuit based on simulation control Download PDFInfo
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Abstract
The utility model relates to peak value sampling fields of measurement, to realize holding and the automatic discharging of multiple echo,high level signal peak, and reduce the requirement to rear class A/D converter circuit conversion speed and single-chip microcontroller processing speed.Thus, the technical scheme adopted by the utility model is that, ping-pong structure peak holding and automatic discharge circuit based on simulation control, by rising edge detection module, across resistance amplification module, second level amplification module, A/D converter circuit and the road N peak holding and automatic discharge circuit are constituted, every road peak holding and automatic discharge circuit include failing edge detection module, monostable trigger module, transconductance type peak value hold module, channel switch, discharge switch, failing edge detection module, first via peak holding and automatic discharge circuit do not include failing edge detection module, after return laser beam is detected, signal is first passed around across resistance amplification module and second level amplification module, it is converted into voltage pulse signal.The utility model is mainly used in peak value sampling measurement occasion.
Description
Technical field
The utility model relates to peak value sampling fields of measurement, lead more particularly, to laser ranging echo-peak sampled measurements
Domain.Concretely relate to ping-pong structure peak holding and automatic discharge circuit based on simulation control.
Background technique
Laser radar so far, is widely used in measuring three-dimensional morphology, unmanned plane avoidance and pilotless automobile from appearance
Equal fields, wherein the most outstanding is application in terms of civil field pilotless automobile.It is continuous with unmanned technology
The indexs such as laser radar range range, angular resolution, range accuracy are also continuously improved in mature, in addition to this, nothing
In terms of requirement of people's driving technology to laser radar is also no longer limited to range measurement, the identification technology of measured object increasingly by
The concern of people.
However during laser ranging, since the laser beam of transmitting is one-wavelength laser, photodetector also has centainly
Wave band limitation, therefore the information such as its color cannot rely on to the identification of target, the monochrome ash of detection reflection echo can only be passed through
Angle value, i.e. reflection echo intensity determine the reflectivity of target object, classify according to different reflected intensitys to measured object,
And then realize the identification of target.Therefore, laser radar should obtain corresponding laser and return while obtaining the laser pulse flight time
The strength information of wave.
To retain echo strength information and realizing the acquisition of echo strength, currently used method is design peak holding electricity
Road for a period of time by the peak holding of echo carries out Analog-digital Converter (hereinafter referred to as AD conversion), to obtain echo strength letter
Breath, and then obtain the single color gradation value of target echo.Meanwhile peak holding circuit should be realized after the completion of AD conversion and be put automatically
Electricity is ready for the holding of next peak value.But when measured object is trees or translucent barrier etc., the same transmitting
Light beam can obtain that the peak of no less than twice return pulse should be acquired more than twice return in order to guarantee the accuracy of target identification
It is worth strength information.And the same exomonental multiecho often has very small time interval, it is assumed that when it is adjacent twice
When the different measured objects that echo measures are at a distance of 3m, the time interval of this twice return is 20ns.At present to continuous impulse peak value
The general approach of sampling is controlled by single-chip microcontroller, i.e., when AD conversion complete when, single-chip microcontroller control peak holding circuit into
Row electric discharge.In order to collect the strength information of the extremely short multiecho of this time interval, at AD conversion speed and single-chip microcontroller
Reason speed proposes high requirement, it is often more important that, traditional peak holding circuit almost cannot achieve to return to repeatedly intensive
The holding of the adjacent peak value of pulse twice of wave.Some scholars propose that a kind of " number+simulation " structure peak holding circuit is come at present
This problem is solved, the switching for keeping channel is realized using multi-disc d type flip flop chip, but its circuit structure is complicated, required D touching
It is more to send out device number of chips, and is not easy to cascade.
Therefore, in order to improve the accuracy of laser radar target identification, circuit cost and feasibility are taken into account, design is based on mould
The peak holding and automatic discharge circuit of the ping-pong structure of quasi- control.
Summary of the invention
In order to overcome the deficiencies of the prior art, the feature multiple, intensive for laser ranging echo, the utility model are intended to mention
The peak holding and automatic discharge circuit of ping-pong structure out based on simulation control.This kind of circuit can be realized multiple echo,high level
The holding of signal peak and automatic discharging, and reduce and rear class A/D converter circuit conversion speed and single-chip microcontroller processing speed are wanted
It asks.For this purpose, the technical scheme adopted by the utility model is that, ping-pong structure peak holding and automatic discharging electricity based on simulation control
Road by rising edge detection module, is put across resistance amplification module, second level amplification module, A/D converter circuit and the road N peak holding and automatically
Circuit is constituted, and every road peak holding and automatic discharge circuit include failing edge detection module, monostable trigger module, transconductance type
Peak value hold module, channel switch, discharge switch, failing edge detection module, first via peak holding and automatic discharge circuit are not
Comprising failing edge detection module, after return laser beam is detected, signal is first passed around across resistance amplification module and second level amplification module,
It is converted into voltage pulse signal；
Further, rising edge detection module 1 detects the voltage pulse signal exported after amplifying twice, opens the
1 tunnel peak holding and automatic discharge circuit monostable trigger module；
Further, the 1st tunnel peak holding and automatic discharge circuit monostable trigger module output signal make the 1st road peak value
It keeps and automatic discharge circuit discharge switch is not turned on, the 1st tunnel peak holding and automatic discharge circuit transconductance type peak value are protected at this time
Module work is held, the peak value of the 1st pulse is obtained and is kept for a period of time；
Further, the 1st tunnel peak holding and automatic discharge circuit transconductance type peak value hold module obtain first pulse
After peak value, the 2nd tunnel peak holding and automatic discharge circuit failing edge detection module detect the failing edge of first peak value, open
2nd tunnel peak holding and automatic discharge circuit monostable trigger module；
Further, the 2nd tunnel peak holding and automatic discharge circuit monostable trigger module output signal make the 1st road peak value
It keeps and automatic discharge circuit channel switch is connected, at this time the 1st tunnel peak holding and automatic discharge circuit transconductance type peak holding
Module no longer receives new pulse；
Further, the 2nd tunnel peak holding and automatic discharge circuit monostable trigger module output signal make the 2nd road peak value
It keeps and automatic discharge circuit discharge switch is not turned on, the 2nd tunnel peak holding and automatic discharge circuit transconductance type peak value are protected at this time
Module work is held, the peak value of the 2nd pulse is obtained and is kept for a period of time；
Further, process identical with the 2nd tunnel peak holding and automatic discharge circuit successively occurs at the road 3~N peak
Value is kept and automatic discharge circuit；
Further, A/D converter circuit is completed within the time that two-way transconductance type peak value hold module is kept to each road mutual conductance
The AD conversion of peak value is kept in type peak value hold module.
Rising edge detection module uses high speed voltage comparator circuit, and it is V that its inverting input terminal threshold voltage, which is arranged,0, positive
Input terminal is that amplified laser echo signal amplitude is Vs, when meeting Vs>V0When, rising edge detection module 1 detects transmitting letter
Number.
Failing edge detection module uses high speed voltage comparator circuit, the n-th tunnel peak holding and automatic discharge circuit failing edge
Detection module normal phase input end is the holding that electricity is the (n-1)th tunnel peak holding and automatic discharge circuit transconductance type peak value hold module
Voltage Vh(n-1), the n-th tunnel peak holding and automatic discharge circuit failing edge detection module inverting input terminal are returned for amplified laser
Wave signal amplitude is Vs, when meeting Vs<Vh(n-1)When, detect the failing edge of (n-1)th pulse.
Monostable trigger module uses monostable circuit, if the temporary steady state time of monostable circuit is t, if laser ranging is completely measured
Cheng Jiguang two-way time is t0, i.e., all echoes will be in time t0It is inside received by a detector, if the single ranging period is T, then should expire
Sufficient T > t > t0。
Transconductance type peak value hold module uses transconductance type peak holding circuit, selects capacitance C smaller, makes it as holding electricity
Hold, can be improved charging rate, be completed in a short time the holding of peak value.
Channel switch is switched using high-speed complimentary metal oxide semiconductor, realizes that channel switches at high speed；
Discharge switch uses hight-speed CMOS switch, and with the extremely short time that is switched on and off, auxiliary realizes that channel high speed is cut
It changes, and the electric discharge of holding capacitor in transconductance type peak value hold module is rapidly completed after the completion of AD conversion.
The characteristics of the utility model and beneficial effect are:
1) it is worked alternatively by multichannel peak holding circuit, overcomes conventional peak holding circuit that can only keep single pulse peak
The shortcomings that value, realizes the sampling to multiple, intensive pulse signal peak value, it is ensured that pulse signature messages integrality.
2) multiple, intensive pulse signal peak value is kept with multichannel peak holding circuit respectively, is can obviously reduce pair
The standard of A/D converter circuit design is relaxed in the requirement of A/D converter circuit conversion speed, reduces A/D converter circuit cost.
Detailed description of the invention:
Fig. 1 a kind of the two-way peak holding and automatic discharge circuit of the ping-pong structure of simulation control.
In Fig. 1,1 is rising edge detection module, and 2 be failing edge detection module, and 3 be monostable trigger module, and 4 be transconductance type
Peak value hold module, 5 be channel switch, and 6 be discharge switch.
Fig. 2 a kind of the multichannel peak holding and automatic discharge circuit of the ping-pong structure of simulation control.
In Fig. 2,1 is rising edge detection module, and 2 be failing edge detection module, and 3 be monostable trigger module, and 4 be transconductance type
Peak value hold module, 5 be channel switch, and 6 be discharge switch.
Specific embodiment
The utility model proposes a kind of simulation control ping-pong structure two-way or multichannel peak holding and automatic discharging
Circuit, comprising: rising edge detection module 1 (1), failing edge detection module 2 (1, every road in addition to the 1st tunnel), monostable trigger
Module 3 (1, every road), transconductance type peak value hold module 4 (1, every road), channel switch 5 (1, every road, respective channels when conducting
Do not receive echo), discharge switch 6 (1, every road, the holding capacitor of respective channels realizes electric discharge when conducting).
The peak holding and automatic discharge circuit of ping-pong structure based on simulation control, can be designed as imitation table tennis structure
Two-way peak holding and automatic discharge circuit, see Fig. 1, before circuit is started to work, all channel switch 5 are not turned on, and are owned
Channel reception peak signal, all discharge switches 6 are connected, and all transconductance type peak value hold modules 4 are in discharge condition, do not keep
Peak signal.
After return laser beam is detected, signal is first passed around across resistance amplification module and second level amplification module, is converted into voltage
Pulse signal.
Further, rising edge detection module 1 detects the voltage pulse signal exported after amplifying twice, opens the
1 road monostable trigger module 3.
Further, 3 output signal of the 1st road monostable trigger module is not turned on the 1st road discharge switch 6, at this time the 1st tunnel
Transconductance type peak value hold module 4 works, and obtains the peak value of the 1st pulse and is kept for a period of time.
Further, after the 1st tunnel transconductance type peak value hold module 4 obtains first peak value of pulse, the detection of the 2nd road failing edge
Module 2 detects the failing edge of first peak value, opens the 2nd road monostable trigger module 3.
Further, 3 output signal of the 2nd road monostable trigger module make the 1st paths switch 5 be connected, at this time the 1st tunnel across
Conductivity type peak value hold module 4 no longer receives new pulse.
Further, 3 output signal of the 2nd road monostable trigger module is not turned on the 2nd road discharge switch 6, at this time the 2nd tunnel
Transconductance type peak value hold module 4 works, and obtains the peak value of the 2nd pulse and is kept for a period of time.
Further, A/D converter circuit completed within the time that two-way transconductance type peak value hold module 4 is kept to each road across
The AD conversion of peak value is kept in conductivity type peak value hold module 4.
The peak holding and automatic discharge circuit of ping-pong structure based on simulation control, can be designed as imitation table tennis structure
N (N > 2) road peak holding and automatic discharge circuit, see Fig. 2, before circuit is started to work, all channel switch 5 are not turned on,
Peak signal is received, all discharge switches 6 are connected, and all channel transconductance type peak value hold modules 4 are in discharge condition, do not keep
Peak signal.
After return laser beam is detected, signal is first passed around across resistance amplification module and second level amplification module, is converted into voltage
Pulse signal.
Further, rising edge detection module 1 is detected through the amplified voltage pulse signal of two-stage, and it is single to open the 1st tunnel
3 output signal of the 3, the 1st road monostable trigger module of stable state trigger module is not turned on the 1st road discharge switch 6, at this time the 1st tunnel across
Conductivity type peak value hold module 4 works, and obtains the peak value of the 1st pulse and is kept for a period of time.
Further, after the 1st tunnel transconductance type peak value hold module 4 obtains the 1st peak value of pulse, the detection of the 2nd road failing edge
Module 2 detects the failing edge of first peak value, opens the 2nd road monostable trigger module 3.
Further, 3 output signal of the 2nd road monostable trigger module make the 1st paths switch 5 be connected, at this time the 1st tunnel across
Conductivity type peak value hold module 4 no longer receives new pulse.
Further, 3 output signal of the 2nd road monostable trigger module is not turned on the 2nd road discharge switch 6, the 2nd tunnel mutual conductance
Type peak value hold module 4 works, and obtains the peak value of the 2nd pulse and is kept for a period of time.
Further, process identical with the 2nd tunnel successively occurs on the road 3~N.
Further, A/D converter circuit is completed within the time that the road N transconductance type peak value hold module 4 is kept to each road mutual conductance
The AD conversion of peak value is kept in type peak value hold module 4.
High speed voltage comparator circuit can be used in rising edge detection module 1, and it is V that its inverting input terminal threshold voltage, which is arranged,0, just
Phase input terminal is that amplified laser echo signal amplitude is Vs, when meeting Vs>V0When, rising edge detection module 1 detects transmitting
Signal.
High speed voltage comparator circuit can be used in failing edge detection module 2, and n-th road (2≤n≤N) failing edge detection module 2 is just
Phase input terminal is the holding voltage V that electricity is the (n-1)th tunnel transconductance type peak value hold module 4h(n-1), inverting input terminal is amplified
Laser echo signal amplitude is Vs, when meeting Vs<Vh(n-1)When, detect the failing edge of (n-1)th pulse.
Monostable circuit can be used in monostable trigger module 3, if the temporary steady state time of monostable circuit is t, if laser ranging
Full scale laser two-way time is t0, i.e., all echoes will be in time t0It is inside received by a detector, if the single ranging period is T, then
T > t > t should be met0。
Transconductance type peak holding circuit can be used in transconductance type peak value hold module 4, selects capacitance smaller capacitive C as holding
Capacitor improves charging rate, completes the holding of peak value in a very short period of time.
High-speed complimentary metal oxide semiconductor switch (hereinafter referred to as cmos switch) can be used in channel switch 5, has pole
Short is switched on and off the time, realizes that channel switches at high speed.
Hight-speed CMOS switch can be used in discharge switch 6, and with the extremely short time that is switched on and off, auxiliary realizes channel high speed
Switch, and the electric discharge of holding capacitor in transconductance type peak value hold module 4 is rapidly completed after the completion of AD conversion.
The utility model is further described with specific example with reference to the accompanying drawing.
A kind of two-way or multichannel peak holding and automatic discharge circuit of the ping-pong structure of simulation control, comprising: rising edge
Detection module 1 (1), failing edge detection module 2 (1, every road in addition to the 1st tunnel), monostable trigger module 3 (1, every road),
Transconductance type peak value hold module 4 (1, every road), channel switch 5 (1, every road), discharge switch 6 (1, every road).
High speed voltage comparator circuit can be used in rising edge detection module 1, and it is V that its inverting input terminal threshold voltage, which is arranged,0, can
It is designed as V0=0.5V, normal phase input end are that amplified laser echo signal amplitude is Vs, when meeting Vs>V0When, rising edge inspection
It surveys module 1 and detects transmitting signal.
High speed voltage comparator circuit, n-th (n >=2) road failing edge detection module, 2 positive can be used in failing edge detection module 2
Input terminal is the holding voltage V that electricity is the (n-1)th tunnel transconductance type peak value hold module 4h(n-1), inverting input terminal is amplified sharp
Optical echo signal amplitude is Vs, when meeting Vs<Vh(n-1)When, detect the failing edge of (n-1)th pulse.
Monostable circuit can be used in monostable trigger module 3, if the temporary steady state time of monostable circuit is t, if laser ranging
Full scale laser two-way time is t0, i.e., all echoes will be in time t0It is inside received by a detector, then should meet T > t > t0.Generally
In the case of T=10us, t0=1us can enable t=5us.
Transconductance type peak holding circuit can be used in transconductance type peak value hold module 4, selects capacitance smaller capacitive as holding
Capacitor improves charging rate, completes the holding of peak value in a very short period of time, can choose the holding capacitor of 100pF.
Hight-speed CMOS switch can be used in channel switch 5, with the extremely short time that is switched on and off, realizes that high-speed channel is cut
It changes.
Hight-speed CMOS switch can be used in discharge switch 6, and with the extremely short time that is switched on and off, auxiliary realizes high-speed channel
Switch, and the electric discharge of holding capacitor in transconductance type peak value hold module 4 is rapidly completed after the completion of AD conversion.
Claims (6)
1. a kind of ping-pong structure peak holding and automatic discharge circuit based on simulation control, characterized in that detected by rising edge
Module is constituted, every road across resistance amplification module, second level amplification module, A/D converter circuit and the road N peak holding and automatic discharge circuit
Peak holding and automatic discharge circuit include failing edge detection module, monostable trigger module, transconductance type peak value hold module, lead to
Road switch, discharge switch, failing edge detection module, first via peak holding and automatic discharge circuit do not include failing edge and detect mould
Block, after return laser beam is detected, signal is first passed around across resistance amplification module and second level amplification module, is converted into voltage pulse letter
Number；
Further, rising edge detection module detects the voltage pulse signal exported after amplifying twice, opens the 1st road peak
Value is kept and automatic discharge circuit monostable trigger module；
Further, the 1st tunnel peak holding and automatic discharge circuit monostable trigger module output signal make the 1st tunnel peak holding
It is not turned on automatic discharge circuit discharge switch, at this time the 1st tunnel peak holding and automatic discharge circuit transconductance type peak holding mould
Block work obtains the peak value of the 1st pulse and is kept for a period of time；
Further, the 1st tunnel peak holding and automatic discharge circuit transconductance type peak value hold module obtain first peak value of pulse
Afterwards, the 2nd tunnel peak holding and automatic discharge circuit failing edge detection module detect the failing edge of first peak value, open the 2nd
Road peak holding and automatic discharge circuit monostable trigger module；
Further, the 2nd tunnel peak holding and automatic discharge circuit monostable trigger module output signal make the 1st tunnel peak holding
It is connected with automatic discharge circuit channel switch, at this time the 1st tunnel peak holding and automatic discharge circuit transconductance type peak value hold module
No longer receive new pulse；
Further, the 2nd tunnel peak holding and automatic discharge circuit monostable trigger module output signal make the 2nd tunnel peak holding
It is not turned on automatic discharge circuit discharge switch, at this time the 2nd tunnel peak holding and automatic discharge circuit transconductance type peak holding mould
Block work obtains the peak value of the 2nd pulse and is kept for a period of time；
Further, process identical with the 2nd tunnel peak holding and automatic discharge circuit successively occurs to protect in the road 3~N peak value
It holds and automatic discharge circuit；
Further, A/D converter circuit is completed within the time that two-way transconductance type peak value hold module is kept to each road transconductance type peak
Value keeps the AD conversion that peak value is kept in module.
2. ping-pong structure peak holding and automatic discharge circuit as described in claim 1 based on simulation control, characterized in that
Rising edge detection module uses high speed voltage comparator circuit, and it is V that its inverting input terminal threshold voltage, which is arranged,0, normal phase input end is
Amplified laser echo signal amplitude is Vs, when meeting Vs>V0When, rising edge detection module detects transmitting signal.
3. ping-pong structure peak holding and automatic discharge circuit as described in claim 1 based on simulation control, characterized in that
Failing edge detection module uses high speed voltage comparator circuit, the n-th tunnel peak holding and automatic discharge circuit failing edge detection module
Normal phase input end is the holding voltage that electricity is the (n-1)th tunnel peak holding and automatic discharge circuit transconductance type peak value hold module
Vh(n-1), the n-th tunnel peak holding and automatic discharge circuit failing edge detection module inverting input terminal are amplified return laser beam letter
Number amplitude is Vs, when meeting Vs<Vh(n-1)When, detect the failing edge of (n-1)th pulse.
4. ping-pong structure peak holding and automatic discharge circuit as described in claim 1 based on simulation control, characterized in that
Monostable trigger module uses monostable circuit, if the temporary steady state time of monostable circuit is t, if laser ranging full scale laser is past
Returning the time is t0, i.e., all echoes will be in time t0Inside be received by a detector, if the single ranging period be T, then should meet T > t >
t0。
5. ping-pong structure peak holding and automatic discharge circuit as described in claim 1 based on simulation control, characterized in that
Transconductance type peak value hold module uses transconductance type peak holding circuit, selects capacitance C, makes it as holding capacitor, can be improved
Charging rate is completed in a short time the holding of peak value.
6. ping-pong structure peak holding and automatic discharge circuit as described in claim 1 based on simulation control, characterized in that
Channel switch is switched using high-speed complimentary metal oxide semiconductor, realizes that channel switches at high speed；Discharge switch is using high speed
Cmos switch, with the extremely short time that is switched on and off, auxiliary realizes that channel switches at high speed, and quickly complete after the completion of AD conversion
At the electric discharge of holding capacitor in transconductance type peak value hold module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821468172.1U CN209514059U (en) | 2018-09-08 | 2018-09-08 | Ping-pong structure peak holding and automatic discharge circuit based on simulation control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821468172.1U CN209514059U (en) | 2018-09-08 | 2018-09-08 | Ping-pong structure peak holding and automatic discharge circuit based on simulation control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085559A (en) * | 2018-09-08 | 2018-12-25 | 天津大学 | Ping-pong structure peak holding and automatic discharge circuit based on simulation control |
| CN113406602A (en) * | 2021-05-21 | 2021-09-17 | 中山大学 | Pulse peak holding circuit and control method |
-
2018
- 2018-09-08 CN CN201821468172.1U patent/CN209514059U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085559A (en) * | 2018-09-08 | 2018-12-25 | 天津大学 | Ping-pong structure peak holding and automatic discharge circuit based on simulation control |
| CN109085559B (en) * | 2018-09-08 | 2022-05-20 | 天津大学 | Table tennis structure peak value holding and automatic discharging circuit based on analog control |
| CN113406602A (en) * | 2021-05-21 | 2021-09-17 | 中山大学 | Pulse peak holding circuit and control method |
| CN113406602B (en) * | 2021-05-21 | 2024-04-26 | 中山大学 | Pulse peak hold circuit and control method |
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