SU1322435A1 - Pulse stretcher - Google Patents

Abstract

The invention can be used in devices for generating or converting pulse signals. The purpose of the invention is to improve the accuracy of the device. The pulse expander contains an element 2 BANKS, a counter 4 pulses, triggers 5, 7 and 9, generators 10 and II sawtooth voltage and block 12 of the comparison. In order to achieve the goal, a BAN element 6 has been introduced into the device and new functional connections have been formed. 2 Il. J. So N3 4 CO SP

Description

The invention relates to a pulse technique and can be used in devices for generating or converting pulse signals.

The purpose of the invention is the accuracy of work.

FIG. 1 is an electrical functional diagram of the device (TWA; FIG. 2 is a timing diagram explaining its operation.

The pulse expander contains an input bus 1, the beginning of the interval, connected to the first input of the first element 2 BAN, the second input of which is connected to the output bus 3, the counting enable input of the counter 4 pulses, the output of the first trigger 5 and the first input of the second element 6 BAN, and the output - with the first input of the second trigger 7, the second input of which is connected to the input bus 8 of the end of the input interval, the first output - with the first input of the trigger 5, and the second output - with the first input of the third trigger 9, the second input of which is connected to the second input the rigger 5, the first input of the first generator 10 of the sawtooth voltage and the output of the counter 4, and the output with the first input of the second generator 11 of the sawtooth voltage, the second input of which is connected to the second input of the element 6, the output of the comparison unit 12 and the input of the counter 4, and the output - with the first input of the comparison unit 12, the second input of which is connected to the output of the generator 10, the second input of which is connected to the output of the element 6 BAN.

The extender works in the following way.

In the initial state, the triggers 5, 7, and 9, the generators 10 and 11 are reset. The first BARN element is open, the counter of 4 pulses is reset by a bullet signal to output 3, and the BAN element 6 is opened by the zero signal of the comparison unit 12. When the pulse of the beginning of the input interval arrives on the bus 1, the expander trigger 7 switches and triggers the switch unit to one state. Through the open element 6 BANGE, the generator 10 switches on, at the output of which a linearly varying voltage with a slope a is formed (Fig. 2, ). When a pulse of the input interval ends at the input 1-pin 8, the trigger 7 is zeroed, switching to one state the trigger 9, which in turn turns on. Yukchaet second generator 11 with a steepness in (Fig. 2, a). For the duration of the spreading pulse on the bus 3 s. Ie-2 PROHIBITION is blocked, prevented the switching of the trigger 7 by the information pulse or interference on the bus 1, and the resetting of the counter 4 is stopped. Lipine-variance of the voltage of the generators 10 and 11 is compared by comparison unit 2, which forms, when they are equal, a pulse of duration At (Fig. 2, b). Comparison unit 12 may be performed, for example, based on a series-connected comparator and a standby multivibrator or

based on a comparator with a pulsed positive feedback delayed by At. The pulses of the comparison unit 12 are counted in the counter 4, zeroing the generator 1 1 and blocking the control signal of the generator 10, so that the voltage at its output during the intervals At does not change. After the end of the impulse, the voltage of the generator 10 continues to increase linearly from the level corresponding to the instant of operation of the comparison block 12, and the voltage of the generator 11 linearly increases from the zero level. The expansion process with periodic zeroing of the generator 11 continues until the counter 4 is filled, the overflow pulse of which returns the triggers 5 and 9 and the generator 10 to the initial state. The response number of the comparison unit 12 is determined by the capacity n of the counter 4. The extender is ready for the next cycle of operation. The duration of Ti before the first operation of the comparison unit 12 is determined by the expression

T, tex. B / (B - a) ktax .. Let its repeated actuation of airflow at the moment of time T-, then from the condition of equality of the voltages of the generators 10 and 11 we get

a () B (T2 -T, - bt). The formula is obtained taking into account the fact that after the first operation of the comparison unit 12, the generator 10 with a steepness a is blocked for time d1, and the generator 1 1 with cruise in turn on at time T | -J-At (Fig. 2). From the last formula we get

Tr .. ,, + At.

Continuing in the same way, we get the expression for Thy. in general.

0

Claims (1)

Invention Formula 0 45 Pulse expander containing the first input bus connected to the first input of the BAN, the second input of which is connected to the output bus, the first input of the counter and the output of the first trigger, and the output to the first input of the second trigger, the second input of which is connected to the second input bus output 50 - with the first input of the first trigger, and the second output - with the first input of the third trigger, the second input of which is connected to the second input of the first trigger, the first input of the first sawtooth generator, and the output of the counter, 55 and the output to the first input of the second sawtooth generator, the second input of which is connected to the input of the counter and the output of the comparison unit, and the output - with the first input of the comparator unit, the second input of which is connected to the output of the first sawtooth generator, characterized in that, in order to improve the accuracy of operation, an additional element BAN, the first input of which is connected to the output 1, and the second input is connected to the input of the counter and the output is with the second input of the first generator pi. yuoza different stress.  byk P S)