SU1252924A1 - Clock pulse generator - Google Patents

Abstract

The invention can be used in measurement technology, television, automatic control circuits. The purpose of the invention is to improve the accuracy of phasing of output pulses. The generator contains triggers 1 and 7, orders of generator 2 pulses, element 3 coincidence, phase selector 4 and driver 5 pulses. The introduction of the sawtooth generator 8, the sampling and storage unit 9, the adder Yu, the trigger P, the comparator 12 and the formation of new connections between the elements of the generator allow phasing of the output pulses of the generator 2 pulses relative to the front of the input start pulse, maintaining their frequency . The accuracy of phasing of these pulses does not depend on the type of generator and, as a result of this, a highly stable crystal oscillator can be used as a generator, providing output pulses with a high temperature and temporal frequency stability and a constant phase relative to the input pulse of the generator. 2 Il. / g J t oi | O 0

Description

The invention relates to a pulsed technical assembly and can be used in measurement technology, television, automatic control circuits.

The purpose of the invention is to increase the accuracy of phasing of output pulses.

In Fig. 1) a functional diagram of a clock pulse generator is presented; Fig. 2 shows timing diagrams illustrating the principle of operation of the clock pulse generator.

The generator contains the first trigger 1, the master pulse generator 2, the coincidence element 3, the phase selector 4, the main 5 and the additional 6 pulse shapers, the second trigger 7, the sawtooth voltage generator 8, the selector and storage unit 9, the adder 10, the additional trigger 11, comparator 12, tires for start-up 13 and stop 14 and output bus 15.

The output of the trigger I is connected to one of the inputs of the coincidence element 3, the phase selector 4, the trigger 7 and the second input of the pulse generator 6, the output of the pulse generator 2 is connected to the input of the phase selector 4, the output of which is connected to the first input of the pulse generator 6 and one of the driver's inputs 5 pulses, the other input of which is connected to one of the inputs of the trigger 1I and the output of the trigger 7, the other input of which is connected to the second output of the pulse generator 6, the first output of which is connected to one of the inputs of the sampling and storage unit 9 and one of the inputs of the sawtooth generator 8, the other input of which is connected to another input of the trigger 11 and the output of the coincidence element 3, the other input of which is connected to the output of the pulse former 5 pulses, the output of the sawtooth voltage generator 8 is connected to another input of the sampling unit 9 and storage and one of the inputs of the adder 10, the other input of which is connected to the output of block 9, the output of the adder 10 is connected to one of the inputs of the comparator 12, the other input of which is connected to the output of the trigger 1, the start bus 13 and stop 14 are connected to

trigger inputs 1 and output bus

to comparato exit

five

0

five

0

five

0

The clock generator operates as follows.

The start-pulse (Fig. 2a) sets the trigger 1 (Fig. 2b), the phase selector 4 compares the phase J of the starting start-pulse with the phase of the output pulse of the generator 2 received at that moment (Fig. 2d) and in accordance with the result of the comparison at the selector output Four phases are formed by clock pulses with a frequency of the generator of 2 pulses and a phase either the same as that of the generator of 2 pulses or shifted 180 (fig.2d).

Simultaneously with the installation of the trigger 1, the sawtooth generator 8 begins to form a linearly increasing voltage at the output (Fig. 2m). With the arrival of the first clock pulse, the sampling pulse shaper 6 (Fig. 2e) stops the sawtooth generator, the output voltage of which thus fucks the phase difference of the internal clock pulses from the output of the selector .4 phase and the start-up pulse, opens the input of the sampling and storage unit 9 and remembers the level of the output voltage of the sawtooth generator 8 at the moment of arrival of the first clock pulse (fig.2n). After the second clock pulse arrives at the input of the imager 6, the sampling pulse ends, a trigger 7 is installed (fig. 2g), opening the input of the imaging circuit 5 of the discharge pulses (fig.2i), from the output of which to the input, opened by the trigger 1 of the coincidence element 3 (fig. 2k), the discharge pulses begin to flow and the sawtooth voltage generator 8 goes over to operation in a clock-driven pulse control mode.

In the adder 10, the voltages applied from the outputs of the sampling and storage unit 9 and the sawtooth voltage generator 8 (in .2e) are nested. Due to the fact that the voltage at the output of the sampling and storage unit 9 contains information about the phase of the clock pulses relative to the front of the input start-pulse, the output of the comparator 2 (Fig. 2k) after removing the lock with a trigger 1 1 (.2l) is formed impulses whose leading edge

rigidly attached to the front of the input - the start of the pulse.

With the arrival of the stop pulse (Fig. 26), trigger I returns to the initial state, preparing the device for a new cycle of operation. The time diagrams of Fig. 2 (second cycle) show the phase change of the pulses of the generator 2 with respect to the phase of the input start-pulse, the response to this of the phase selector 4 and the changes in the output voltages of the sampling and storage unit 9, the adder 10, the duration of the comparator output pulses} 2 These diagrams also show the preservation of the phase of the leading edge of the output pulses of the device relative to the front of the input start-pulse.

Thus, the proposed generator performs phasing of the output pulses of the pulse generator used in it relative to the front of the input start-pulse, keeping their frequency unchanged. The accuracy of the phasing of these pulses does not depend on the type of generator and, as a result, a highly stable crystal oscillator can be used as a generator, which provides a pulse temperature generator with a high temperature and time frequency stability and a constant phase relative to the input pulse of the generator.

In addition, it is possible to set the required output-generator phase of the generator by adjusting the level of the comparator reference voltage.

Claims (1)

Invention Formula Clock generator, which contains the master pulse generator, the first and second triggers, the basics 0 five 0 five pulse shaper, phase selector -A match element, one of the inputs of which is connected to the output of the main pulse shaper, and the other input is connected to the output of the first trigger, one of the inputs of which is connected to the trigger, characterized in that, in order to output phasing accuracy pulses, an additional trigger and pulse shaper, as well as a sawtooth generator, a sampling and storage unit, an adder and a comparator, the first input of which is connected to the output of an additional the second input is connected to the output of the adder, the first input of which is connected to the upper unit of the sample and storage unit, and the second input is connected to the output of the sawtooth generator and the first input unit of the sample and storage unit, the second input of which is connected to the first output of the additional driver pulses .and the first input of the sawtooth generator, the second input of which is connected to the output of the coincidence element and the first input of the sub-pole trigger, the second input of which is connected to the output of the second trigger and p the primary input of the main pulse generator, the second input of which is connected to the output of the phase selector and the first input of the additional pulse driver, the second output of which is connected to the first input of the second trigger, the second input of which is connected to the second input of the additional pulse driver, the output of the first trigger and the first input of the phase selector , the second input of which is connected to the output of the master pulse generator.