SU415793A1 - - Google Patents

Description

one

The invention relates to radio engineering. The former can be used in digital time interval gauges.

Known pulse shaper, containing two channels of formation, each of which. contains a cascade-connected input limiter associated with the operating mode switches, a linear amplifier, an addition circuit, a threshold device, a differentiating circuit, a limiter, and a shaping device.

The output of the latter is connected to the second input of the addition circuit of another channel of formation, the third input, which is connected to the source of the reset signals. This driver requires a long duration from the input pulse.

The purpose of the invention is to reduce the minimum duration of the input pulse. For this, a delay line is introduced between the source of input pulses and mode switches.

FIG. 1 shows a functional block diagram of the proposed shaper; in fig. 2 - diagrams of his work.

The shaper contains input limiters 1 and 2, linear amplifiers 3 and 4, addition circuits 5 and 6, threshold devices 7 and 8, differentiating circuits 9 and 10, limiters 11 and 12, output shaping devices

Wa 13 and 14, line 15 delay and switches 16, 17 and 18 modes of operation.

In the tethering mode, to the falling part of the input pulse fed to the input, 19, which corresponds to the position of the switches indicated in FIG. 1, the shaper operates as follows.

In the initial state, the input potential 19 is considered equal to zero. When setting the operation levels L / i and Of (see Fig. 2) above zero, the output of amplifiers 3 and 4 establishes a relatively high voltage level, which through circuits 5 and 6 maintains ycTpoiicTBa 7 n 8 in a state with a high

level.

When applied to the input, 19 pulses of duration less than the delay time tis, the input voltage of the limiter 1 begins to increase.

FIG. 2, the following notation is used: t / oi - latching voltage of the limiter 1, t / 02 - unlocking voltage of the limiter 1, - latching voltage of the limiter 2, t / 04 - unlocking voltage of the limiter 2.

Further, the first index at voltage denotes the block number, the second - the voltage level at the output of this block.

Starting from the moment of time oz, on reaching the leading edge of the tc signal

the f / 02 level, the input signal starts to pass through the amplifier 3 and the circuit 5 to the input of the device 7. When the falling section reaches the t / si level at the time tf in the descaling section of the device iiiCTBa 7, it triggers. At this point in time, the input signal is equal to the f / i value of the device response level for the signal parts with a positive derivative. The operation of the device 7 causes the operation of all subsequent, their blocks of the first channel and at the output of the imaging unit 13 a signal of negative polarity appears, which through the circuit 6 acts on the device 8 and causes its operation. However, the output driver 14 does not work due to the direction of the action of the limiter 12.

When the input signal reaches the L / oi level, at which the locking of the limiter 1 occurs, the potential change in the first channel stops. When the input signal drops to a bullet level, the potentials at the characteristic points of the first channel change as shown in fig. 2 (see t / a,

6. f / 7). ,,

After the time Ti5 after the appearance of the input signal, a delayed input pulse i / n appears at the input of the second channel (see Fig. 2). In this case, in the second channel, processes similar to those in the nerve channel begin to occur. However, due to the fact that the delay delay line 15 is less effective; delays t and the duration tis of the pulse of the imager 13, operating on the device 8, subsequently do not react on the leading edge of the pulse from the output of the amplifier 4.

After the time interval T + tia, the feedback pulse from the shaper 13 stops and the device 8 is only iodized by the signal from the amplifier 4. Therefore, in the decay of the input pulse Un, the device 8 triggers when the signal Ue reaches the level (/ / 83. At this point in time, 2 G input signal is equal to the magnitude of the device trigger level Us for the signal parts with a negative derivative. Actuation of device 8 triggers the operation of all subsequent blocks of the second channel, since the field The pulse at the output of the circuit 10 is such that the limiter 12 transmits it to the start of the generator 14. Therefore, at the time of Zr, when the falling input signal Un crosses the set level U, a polarity pulse appears at the output of the device.

Thus, the temporal position of the output pulse in the considered mode

corresponds to Zs until the moment Z-T 0 coincides with the moment / Ez, at which the pulse ends at the output of the imaging unit 13. This condition determines the minimum duration of the input pulse.

Subject- and w obrete-n and

A pulse shaper containing two shaping channels, each of which contains a cascade-connected input limiter associated with operating mode switches, a linear amplifier, an addition circuit, a threshold device, a differentiating circuit, a limiter, and an output shaping device, the output of which is connected to the second input the addition circuit of another drip formation, the third input of which is connected to the source of the reset signal, characterized in that, in order to reduce

0 the minimum duration of the input pulse, between the source of the input pulses and the operating mode switches, a delay delay was introduced.