CN108616467A - Continuous time adaptive equalizer - Google Patents
Continuous time adaptive equalizer Download PDFInfo
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- CN108616467A CN108616467A CN201611139643.XA CN201611139643A CN108616467A CN 108616467 A CN108616467 A CN 108616467A CN 201611139643 A CN201611139643 A CN 201611139643A CN 108616467 A CN108616467 A CN 108616467A
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- pipes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03159—Arrangements for removing intersymbol interference operating in the frequency domain
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03184—Details concerning the metric
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The present invention provides a kind of continuous time adaptive equalizer, including equalization filter circuit, clipping amplifier circuit, high-pass filtering circuit, rectification circuit, error amplifier circuit and power-sensing circuit, it is characterized in that, further include a power-sensing circuit PD, the output end connection power-sensing circuit PD of equalization filter, the output end of power-sensing circuit PD is connected to the gain control end (ends gctrl) of equalization filter, equalization filter is according to power-sensing circuit PD to low frequency power testing result, the gain amplifier of the low frequency part of the input signal of equalization filter is adjusted.The quality for receiving signal can be improved in the present invention, does not need clock signal, reliability is high, can be applied to the bus receivers such as Ethernet, 1393, improves the correctness of data receiver.
Description
Technical field
The invention belongs to design of electronic circuits technologies, are related to a kind of high speed signal continuous time adaptive equalizer.The hair
It is bright to can be applied to high-speed bus receiver.
Background technology
In wired communication system, due to non-ideal factors such as Kelvin effect and dielectric losses, channel shows as low pass spy
Property, when data transfer rate is considerably beyond channel width, intersymbol interference (ISI) will be caused, cause currently receive numerical digit pulsewidth and
Amplitude reduces.The non-ideal characteristic of communication channel does not only result in intersymbol interference (ISI), seriously limits transmission rate and biography yet
Defeated distance.Therefore, in order to improve the transmission rate of communication system or extend transmission distance, the receiving terminal of communication system must be right
The signal received carries out isostatic compensation, inhibits the influence of intersymbol interference.
In practical wired communication system, the accurate characteristic of channel is not known in advance.Therefore, the balanced device being pre-designed
It is not in optimum state.For example, the length of channel constantly changes in different application or the damage curve of channel can be with
The difference of PCB manufacturing process and change.In view of the foregoing, the penalty coefficient of balanced device needs adaptive setting.
In Jong-Sang Choi, Moon-Sang Hwang, Deog-Kyoon Jeong, " A 0.18-umCMOS 3.5-
Gb/s Continuous-Time Adaptive Cable Equalizer Using Enhanced Low-Frequency
Gain ControlMethod,”IEEE J.Solid-State Circuits,vol.39,pp.419-425,March 2004.
By the structure diagram that traditional adaptive equalizer is disclosed herein.Although typical adaptive equalization structure can realize adaptive equalization
Function, but it there are two disadvantages：First, cannot be adjusted to the power of low frequency signal；Second is that adaptive adjusting range compared with
It is narrow.
Invention content
The present invention proposes a kind of continuous time adaptive equalizer, the shortcomings that capable of preferably overcoming typical structure, to low
The power of frequency signal is adjusted, and to be compensated to the non-ideal characteristic of channel, the influence of intersymbol interference, raising is inhibited to connect
The quality of the collection of letters number reduces the bit error rate to ensure the correctness of bus reception.
The present invention adds a power-sensing circuit in the output of equalization filter, and the effect of the power-sensing circuit is
The low frequency power of equalization filter output signal is detected, equalization filter filters equilibrium according to low frequency power testing result
The gain amplifier of the low frequency part of the input signal of wave device is adjusted.
The specific technical solution of the present invention is as follows：
A kind of continuous time adaptive equalizer, including, equalization filter, power-sensing circuit PD, limiting amplifier, two
A high-pass filter, rectification circuit and error amplifier, wherein the ports in of equalization filter receive input signal Din, balanced
The output end connection power-sensing circuit PD of filter, the input terminal of the first high-pass filter and limiting amplifier LA, first is high
The output end of bandpass filter and the negative input end of rectification circuit connect, the output end of limiting amplifier LA and the second high-pass filter
Input terminal connection, the positive input terminal of the output end of the second high-pass filter and rectification circuit connects, the negative output of rectification circuit
The negative terminal of end connection error amplifier EA, the anode of the positive output end connection error amplifier of rectification circuit, error amplifier
Output end connects the Zero magnitude control end (ends zctrl) of equalization filter, and the output end of limiting amplifier connects data output end
(ends Dout), which is characterized in that further include a power-sensing circuit PD, the output end connection power detection electricity of equalization filter
The output end of road PD, power-sensing circuit PD are connected to the gain control end of equalization filter (ends gctrl), equalization filter root
According to power-sensing circuit PD to low frequency power testing result, to the gain amplifier of the low frequency part of the input signal of equalization filter
It is adjusted.
Power-sensing circuit PD is detected the power of input signal, by testing result and the power threshold of setting into
Row compares, and the difference of the two is carried out Integral Processing, and Integral Processing result is output to the gain control end of equalization filter
(ends gctrl).The signal that equalization filter is received according to gain control end (ends gctrl) is to the zero of equalization filter, pole
Frequency is adjusted, to realize that the gain amplifier to the low frequency part of the input signal of equalization filter adjusts.
The power-sensing circuit includes：NMOS tube M1, M2, M5, M6, M9, M10, M13, M14, M16, M17 and M19,
PMOS tube M3, M4, M7, M8, M11, M12, M15 and M18, integrating capacitor Cint, wherein
Input vip is connected to the grid of M1 pipes, and input vin is connected to the grid of M2 pipes, and M1 pipes and the source electrode of M2 pipes pass through
Current source 10 is connected to ground, and the drain electrode of M1 pipes is connected to grid and the drain electrode of M3 pipes, and the drain electrode of M2 pipes is connected to the grid of M4 pipes
And drain electrode, M3 pipes and the source electrode of M4 pipes are connected to power supply VDD, M7 pipe source electrodes are connected to power supply, and the grid of M7 pipes is connected to M4 pipes
Drain electrode, the drain electrode of M7 pipes are connected to the drain electrode of M5 pipes, and the grid of M5 pipes is connected to grid and the drain electrode of M6 pipes, and the source electrode of M5 pipes connects
It is connected to ground, the source electrode of M6 pipes is connected to ground, and the drain electrode of M6 pipes is connected to the drain electrode of M8 pipes, and the grid of M8 pipes is connected to the leakage of M3 pipes
The source electrode of pole, M8 pipes is connected to power supply, and M11 pipe source electrodes are connected to power supply, and the grid of M11 pipes is connected to the drain electrode of M3 pipes, M11 pipes
Drain electrode be connected to the drain electrodes of M9 pipes, the grid of M9 pipes is connected to grid and the drain electrode of M10 pipes, and the source electrode of M9 pipes is connected to ground,
The source electrode of M10 pipes is connected to ground, and the drain electrode of M10 pipes is connected to the drain electrode of M12 pipes, and the grid of M12 pipes is connected to the drain electrode of M4 pipes,
The source electrode of M12 pipes is connected to power supply, and the source electrode of M15 pipes is connected to power supply, and the grid of M15 pipes is connected to the drain electrode of M7 pipes, M15 pipes
Drain electrode be connected to the drain electrodes of M14 pipes, the grid of M14 pipes is connected to the grid of M15 pipes, and the source electrode of M14 pipes is connected to M13 pipes
Drain electrode, the grid of M13 pipes are connected to the drain electrode of M11 pipes, and the source electrode of M13 pipes is connected to ground, and the source electrode of M18 pipes is connected to power supply,
The grid of M18 pipes is connected to the drain electrode of M11 pipes, and the drain electrode of M18 pipes is connected to the drain electrode of M17 pipes, and the grid of M17 pipes is connected to
The grid of M18 pipes, the source electrode of M17 pipes are connected to the drain electrode of M16 pipes, and the grid of M16 pipes is connected to the drain electrode of M7 pipes, M16 pipes
Source electrode is connected to ground, and the source electrode of M19 pipes is connected to ground, and the grid of M19 pipes is connected to the drain electrode of M15 and M18 pipes, the leakage of M19 pipes
Pole is connected to the output end of current source 9, and the input terminal of current source 9 is connected to the output end of current source 8, the input terminal of current source 8
It is connected to power supply, the output end of current source 8 is connected to the ends output vo, capacitance CintTop crown be connected to output vo ends, capacitance
CintBottom crown be connected to ground.
The present invention has the advantage that：
1, the present invention provide continuous time adaptive equalizer, increase a power-sensing circuit, equalization filter according to
Low frequency power testing result is adjusted the gain amplifier of the low frequency part of the input signal of equalization filter.Low frequency can be achieved
The Gain tuning of signal increases adaptive adjusting range, thus it is more preferable to the compensation effect of signal, it effectively improves and receives signal
Quality.
2, power-sensing circuit proposed by the present invention can effectively detect the power of signal, and internal construction power definite value certainly,
External offer is provided, does not increase circuit port quantity.
Description of the drawings
Fig. 1 is traditional equalizer structure block diagram
Fig. 2 is that the method for the present invention realizes structure diagram；
Fig. 3 is the circuit diagram of power-sensing circuit PD in the present invention；
1 is equalization filter, and 2 be power-sensing circuit, and 3 be limiting amplifier, and 4 and 5 be high-pass filter, and 6 be rectification
Circuit, 7 be error amplifier, and Din is input signal end, and Dout is output signal end, 8,9,10 is respectively first, second, the
Three current sources,
M1, M2, M5, M6, M9, M10, M13, M14, M16, M17 and M19 be NMOS tube, M3, M4, M7, M8, M11, M12,
M15 and M18 is PMOS tube, CintFor integrating capacitor, VDDFor power supply.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, technical scheme of the present invention is clearly and completely stated.
A kind of continuous time adaptive equalizer, including, equalization filter, power-sensing circuit PD, limiting amplifier, two
A high-pass filter, rectification circuit and error amplifier, wherein the ports in of equalization filter receive input signal Din, balanced
The output end connection power-sensing circuit PD of filter, the input terminal of the first high-pass filter and limiting amplifier LA, first is high
The output end of bandpass filter and the negative input end of rectification circuit connect, the output end of limiting amplifier LA and the second high-pass filter
Input terminal connection, the positive input terminal of the output end of the second high-pass filter and rectification circuit connects, the negative output of rectification circuit
The negative terminal of end connection error amplifier EA, the anode of the positive output end connection error amplifier of rectification circuit, error amplifier
Output end connects the Zero magnitude control end (ends zctrl) of equalization filter, and the output end of limiting amplifier connects data output end
(ends Dout), which is characterized in that further include a power-sensing circuit PD, the output end connection power detection electricity of equalization filter
The output end of road PD, power-sensing circuit PD are connected to the gain control end of equalization filter (ends gctrl), equalization filter root
According to power-sensing circuit PD to low frequency power testing result, to the gain amplifier of the low frequency part of the input signal of equalization filter
It is adjusted.
Power-sensing circuit PD is detected the power of input signal, by testing result and the power threshold of setting into
Row compares, and the difference of the two is carried out Integral Processing, and Integral Processing result is output to the gain control end of equalization filter
(ends gctrl).The signal that equalization filter is received according to gain control end (ends gctrl) is to the zero of equalization filter, pole
Frequency is adjusted, to realize that the gain amplifier to the low frequency part of the input signal of equalization filter adjusts.
The present invention provides a kind of power-sensing circuit, the power-sensing circuit course of work：
Example 1
The quantitative proportion of differential pair tube M7 pipe and M8 pipes is set,
M7 pipe quantity：M8 pipes quantity=4：1
The m=4 of M7 pipes is set, the m=1 of M8 pipes is set.
The quantitative proportion of differential pair tube M11 pipe and M12 pipes is set,
M11 pipe quantity：M12 pipes quantity=4：1
The m=4 of M11 pipes is set, the m=1 of M12 pipes is set.
The current value that current source 8 is arranged is 20mA, and the current value of current source 9 is 15mA, and the current value of current source 10 is
0.5mA。
Example 2
The quantitative proportion of differential pair tube M7 pipe and M8 pipes is set,
M7 pipe quantity：M8 pipes quantity=6：1
The m=6 of M7 pipes is set, the m=1 of M8 pipes is set.
The quantitative proportion of differential pair tube M11 pipe and M12 pipes is set,
M11 pipe quantity：M12 pipes quantity=6：1
The m=6 of M11 pipes is set, the m=1 of M12 pipes is set.
The current value setting of current source 8 and 9
The current value that current source 8 is arranged is 20mA, and the current value of current source 9 is 15mA, and the current value of current source 10 is
0.5mA。
From example 1 and example 2 as can be seen that passing through the quantitative proportion for setting differential pair tube, to realize internal self-built power domain
Value, is not required to external offer, does not increase circuit port quantity
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (4)
1. a kind of continuous time adaptive equalizer, it is characterised in that：Including equalization filter, power-sensing circuit PD, amplitude limit
Amplifier, two high-pass filters, rectification circuit and error amplifier, wherein the ports in of equalization filter receive input letter
Number Din, the input terminal of the first high-pass filter and limiting amplifier LA, the output end of the first high-pass filter and rectification circuit
Negative input end connects, and the output end of limiting amplifier LA is connect with the input terminal of the second high-pass filter, the second high-pass filter
Output end and the positive input terminal of rectification circuit connect, the negative terminal of the negative output terminal of rectification circuit connection error amplifier EA is whole
The anode of the positive output end connection error amplifier of current circuit, the zero control of the output end connection equalization filter of error amplifier
End (ends zctrl) processed, the output end connection data output end (ends Dout) of limiting amplifier, which is characterized in that further include one
The output end of power-sensing circuit PD, equalization filter connect power-sensing circuit PD, and the output end of power-sensing circuit PD connects
It is connected to the gain control end (ends gctrl) of equalization filter, equalization filter examines low frequency power according to power-sensing circuit PD
It surveys as a result, being adjusted to the gain amplifier of the low frequency part of the input signal of equalization filter.
2. the continuous time adaptive equalizer according to claim 1, which is characterized in that power-sensing circuit
PD is detected the power of input signal, and testing result is compared with the power threshold of setting, and by the two difference into
Integral Processing result, is output to the gain control end (ends gctrl) of equalization filter by row Integral Processing, equalization filter according to
The signal that gain control end (ends gctrl) receives is adjusted the zero of equalization filter, pole frequency, to realize to equal
The gain amplifier adjustment of the low frequency part of the input signal of weighing apparatus filter.
3. continuous time adaptive equalizer according to claim 1 or 2, which is characterized in that the power detection electricity
Road includes：NMOS tube M1, M2, M5, M6, M9, M10, M13, M14, M16, M17 and M19, PMOS tube M3, M4, M7, M8, M11,
M12, M15 and M18, integrating capacitor Cint, wherein
Input vip is connected to the grid of M1 pipes, and input vin is connected to the grid of M2 pipes, and M1 pipes and the source electrode of M2 pipes pass through electric current
Source 10 is connected to ground, and the drain electrode of M1 pipes is connected to grid and the drain electrode of M3 pipes, and the drain electrode of M2 pipes is connected to grid and the leakage of M4 pipes
The source electrode of pole, M3 pipes and M4 pipes is connected to power supply VDD, M7 pipe source electrodes are connected to power supply, and the grid of M7 pipes is connected to the leakage of M4 pipes
Pole, the drain electrode of M7 pipes are connected to the drain electrode of M5 pipes, and the grid of M5 pipes is connected to grid and the drain electrode of M6 pipes, the source electrode connection of M5 pipes
Source electrode to ground, M6 pipes is connected to ground, and the drain electrode of M6 pipes is connected to the drain electrode of M8 pipes, and the grid of M8 pipes is connected to the leakage of M3 pipes
The source electrode of pole, M8 pipes is connected to power supply, and M11 pipe source electrodes are connected to power supply, and the grid of M11 pipes is connected to the drain electrode of M3 pipes, M11 pipes
Drain electrode be connected to the drain electrodes of M9 pipes, the grid of M9 pipes is connected to grid and the drain electrode of M10 pipes, and the source electrode of M9 pipes is connected to ground,
The source electrode of M10 pipes is connected to ground, and the drain electrode of M10 pipes is connected to the drain electrode of M12 pipes, and the grid of M12 pipes is connected to the drain electrode of M4 pipes,
The source electrode of M12 pipes is connected to power supply, and the source electrode of M15 pipes is connected to power supply, and the grid of M15 pipes is connected to the drain electrode of M7 pipes, M15 pipes
Drain electrode be connected to the drain electrodes of M14 pipes, the grid of M14 pipes is connected to the grid of M15 pipes, and the source electrode of M14 pipes is connected to M13 pipes
Drain electrode, the grid of M13 pipes are connected to the drain electrode of M11 pipes, and the source electrode of M13 pipes is connected to ground, and the source electrode of M18 pipes is connected to power supply,
The grid of M18 pipes is connected to the drain electrode of M11 pipes, and the drain electrode of M18 pipes is connected to the drain electrode of M17 pipes, and the grid of M17 pipes is connected to
The grid of M18 pipes, the source electrode of M17 pipes are connected to the drain electrode of M16 pipes, and the grid of M16 pipes is connected to the drain electrode of M7 pipes, M16 pipes
Source electrode is connected to ground, and the source electrode of M19 pipes is connected to ground, and the grid of M19 pipes is connected to the drain electrode of M15 and M18 pipes, the leakage of M19 pipes
Pole is connected to the output end of current source 9, and the input terminal of current source 9 is connected to the output end of current source 8, the input terminal of current source 8
It is connected to power supply, the output end of current source 8 is connected to the ends output vo, capacitance CintTop crown be connected to output vo ends, capacitance
CintBottom crown be connected to ground.
4. continuous time adaptive equalizer according to claim 3, which is characterized in that the power threshold passes through PMOS
The number ratio of pipe is voluntarily established inside circuit, need not be externally supplied.
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Effective date of registration: 20221018 Address after: Room S303, Innovation Building, No. 25, Gaoxin 1st Road, Xi'an, Shaanxi 710075 Patentee after: XI'AN XIANGTENG MICROELECTRONICS TECHNOLOGY Co.,Ltd. Address before: No.15, Jinye 2nd Road, Xi'an, Shaanxi 710000 Patentee before: AVIC XI''AN AERONAUTICS COMPUTING TECHNIQUE RESEARCH INSTITUTE |