SU455468A1 - Pulse shaper on the leading and trailing edge of the input pulse - Google Patents

Description

one

The invention relates to a pulse shaper and can be used, for example, in logic devices to control the operation of logic circuits, in frequency multipliers.

Known pulse shaper on the leading and trailing edges of the input pulse, the contents of the static trigger, whose outputs are connected to the first inputs of two coincidence circuits, and the source of input pulses connected to the second input of the first circuit are the same 10 directly, and to the second input of the second coincidence circuit via an inverter.

A disadvantage of the known former is that the duration of the output pulses generated on the leading and trailing edges is different due to the variation of the parameters of the elements of different coincidence circuits, whose speed, as well as the trigger response time, determine the duration of the output pulses.

The purpose of the invention is to improve the accuracy of the formation of output pulses and to obtain, at one of the outputs of the shaper, the output nair of the double frequency.

This is achieved by introducing a delay device and an OR circuit in the driver, the inputs of which are connected to the outputs of the first and second coincidence circuits, and the output connected via a delay device to the counting input of a static trigger.

The drawing shows a block diagram of the proposed formate.

The pulse shaper on the leading and trailing edges of the input pulse contains a static trigger 1, the outputs of which are connected to the first inputs of the matching circuits 2 and 3, the source 4 of the input pulses connected to the second input of the first matching circuit, and to the second input of the second matching circuit through the inverter 5 , delay device 6 and the circuit OR 7. The inputs of the circuit OR 7 are connected to the outputs of the first 2 and second 3 schemes of coincidence, and the output is connected via the delay device 8 to the counting input of the static trigger 1. From the output of the circuit coincidence 2 removes the pulse formed on the leading edge of the input signal, from the output of the coincidence circuit 3 - on the falling edge, from the output of the OR 7 circuit, output pulses of double frequency are removed.

Pulse Former operates as follows.

By the reset signal, the trigger 1 is set to one, in which there is a high potential at the single output and a low potential at the zero output. Zairesh

low potential zero trigger output 1

enters the first input of the coHiiaAcinisi 3 scheme, and the resolving high potential from the single output of trigger 1 enters the first input of the coincidence circuit 2, If there is no input signal from source 4 at the second input of the coincidence circuit 2, the latter will be closed. Therefore, in the initial state, both coincidence circuits are closed, and their outputs have a low potential.

When a positive field is received from the 4 1 M pulse of the positive floor, the SoPade1P1 2 circuit opens, and a high potential appears at its output, also opening the OR 7 circuit, the output through the delay device 6, where it is delayed by a certain an adjustable time changes the state of trigger 1 to zero. In this case, the coincidence circuit 3 is opened to the first input, and circuit 2 is closed, and from the output of the coincidence circuit 2, the pulses are no longer removed.

At the end of the input positive pulse, the coincidence circuit 3 opens at the second input, and a high potential appears at its output and at the input of the OR7 circuit. From the output of the ILR1 7 circuit, a pulse arrives at the output n to the input of the delay device 6, changing trigger on the opposite, i.e., sets trigger 1 to the initial one state. There is no pulse at the output of coincidence circuit 3.

Thus, the duration of the output imiulses formed on the falling edge of the input pulse, as well as the duration of the output 11pulses () in the shape of the output pulse, depends on the BJJCmenu of the delay of the impulse in the delay device - When the next input pulses arrive, the generator's operation cycle. .

) lzlovan1 static trigger 1 with a counting input pozn () get output

impulses, ravp, 1st time duration, since their duration depends on the same elements: trigger I, delay devices 6 and the OR 7 scheme. In addition, you can get emulsions of a given length but the front and rear edge of the input signal, regular delay time.

Subject invention

Shaper pulse on the front and

zadn.mu the front of the input pulse, containingu {im static trigger, the outputs of which are connected to the first inputs of the two matching circuits, and the source of the input pulse, connected to the second input of the first circuit

coincidence directly, and to the second input of the second circuit coincidence through the inverter, so that, in order to improve the accuracy of the formation of output pulses and receive at one of the outputs of the doubler frequency converter, a delay device is inserted into it and the OR circuit, whose inputs are connected to the outputs of the first and second circuits, is the same, and the output is connected through the said delay device to the counting

static trigger input.

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