SU552685A1 - Pulse shaper - Google Patents

Description

(54) PULSE FORMER

one

The device relates to the field of discrete technology, in particular to controls, and can be used to generate timing pulses in digital systems.

A device for generating pulses of a certain duration is known, which contains reference pulse generators, counters, gating circuits.

one.

However, the known device has a small frequency range.

The closest in technical essence to the invention is a device comprising a reference pulse generator, gating, multivibrator, reset circuit 2.

A disadvantage of the known device is the small range of variation in the frequency and duration of the output pulses, due to the complexity of varying the frequency and duty cycle of the multivibrator over large limits and the interdependence of changes in the conversion factor of the counter and the multivibrator duty cycle at the frequency or duration of the output pulses.

The aim of the invention is to expand the range of frequency and duration of the output pulses of the driver.

This is achieved by the fact that a pulse shaper containing a reference frequency generator connected to the input of frequency divider n to the first input of the gating unit, the output of which is connected to the input of counter 1: mplses, has an trigger and OR elements, the output of which is connected to the second through a trigger input to the strobe unit and to the installation input of the pulse counter, the output of which is connected to the first input OR, the second input of the OR element is connected to the output of the frequency divider.

The drawing shows a diagram of the proposed pulse formation.

The shaper consists of a geyerator 1 reference pulses, frequency divider 2, logic circuit OR 3, counting trigger 4, gating circuit 5, counter 6, output 7 of counter 6, output 8 of the generator of support pulses, output 9 of the frequency difference 2, output 10 of the logic circuit OR 3, output 11 of the counting trigger 4, output 12 of the gate circuit 5.

Shaper pmpul1, svppp turn on the power supply signals of the reference pulse generator salgoustaiav; 1H15 is in the same position, that is, the counter 6 and counting trigger 4 are set to zero position g pa corresponding to: . From this moment on, the output 11 of the counting trigger 4 appears. Pulses with a frequency of fo / n and duration RTo, where / O and Go are the frequency and repetition period of the reference pulse generator, n is the division factor of the divider 2, k is the conversion factor counter 6.

The operation of the device can be understood by the example of the formation of a single pulse.

The pulse from output 9 of frequency divider 2 is fed through the circuit OR 3 to the input of counting trigger 4 and causes it to trigger. The output 11 of the counting trigger 4 shows the potential of the logical unit, which opens the gate circuit 5, and the input of the counter 6 begins to receive pulses from the reference pulse generator I. After the passage of k pulses at the output 7 of the counter 6, a signal is generated which, on the input counting flip-flop 4 through the scheme OR 3, brings it to the zero state. The formation of the output pulse at the output 11 thus ends, and the flow of pulses from the generator 1 to the input of the counter 6 is stopped. The described process is repeated with the arrival of the next pulse from the frequency divider.

The frequency and duration of the output pulses can vary over a wide range independently of one another by changing

the coefficient n of the frequency divider 2 and the conversion factor k of the counter 6. Duty ratio

l

output pulses Q:

can also out

vary widely, since k can vary from n-1 to 1, while in the known device the duty cycle of the output pulses is approximately equal to the duty cycle of the multivibrator, does not exceed 5-10.

Claims (2)

1. Auth. St. No. 316188, cl. H OZK 3/72, 1969. 2. Japan patent number 47-40501, cl. 98 (5) C 11, 1972.