SU663089A2 - Timing pulse generator - Google Patents

Description

(54) THE CLOCK GENERATOR I. / PULSES

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This invention relates to the field of computing. The generator can be used to form a series of clock pulses.

Known clock pulse generators (GTIs) 1 are known, the disadvantage of which is the distortion of the shape of the first and last pulses of the series.

The closest technical solution to the proposed is the GTI on ed. St. 307502, the contents of a paraphase pulse generator, a switching device, a half-adder, and a NAND element. A disadvantage of this device is the distortion of the shape of the last clock pulse of the series.

The purpose of the invention is to prevent distortion of the shape of the last clock pulse of the series.

This goal is achieved by the fact that in the GTI on the NAND elements, containing a paraphase pulse generator, a commutator device, a half adder and the NAND element (OR), two additional AND elements are inserted (OR), and the inputs of one of them are connected to the outputs of the input elements of the AND-NOT half-adder, and

OUTPUT - to the input of another additional element AND-NOT (ILR1-NOT), the second input of which is connected to the launch bus, and the joint input to the combined inputs of the switching device.

The drawing shows a schematic diagram of a device made according to the invention.

The device contains a half-adder, made on the elements AND-NOT (OR-NO) 1,2,3, a switching device, made on the elements AND-NOT (OR-NOT) 4.5 elements AND-NOT (OR-NOT) 6,7 , 8 and paraphase pulse generator 9.

The device works as follows

In the initial state, the control signal “Starting the GTI is equal to the bullet, and the signals at the outputs of elements 4 and 5 of the switching device are equal to one. The sequence of mutually inverse pulses a and a from the output of the pulse generator 9 is fed to the inputs of elements 1 and 2 of the half-adder, causing them to alternate operation. In this case, if there is a time shift between the signals a and a, at the moments of equality of the values of these signals at the output of element 6, a signal is set equal to zero. Thus, at any point in time at the inputs of element 3 there is at least one signal with a zero value, therefore the signal at the output of the element always has a value of one.

In the initial state, the signals at the outputs of the cells 6 and 7 are mutually inverse. This achieves the presence at any time of a zero signal at least at one of the inputs of elements 4 and 5.

When the signal "Starting a GTI (the signal" Starting a GTI becomes equal to zero) appears at the output of element 7, a signal equal to one appears. Depending on the output of which of elements 1 or 2 at a given time, there is a signal equal to zero, the input of element 3 passes a direct or inverse signal from the output of generator 9.

With the disappearance of the signal, the GTI triggering a signal value equal to zero at the output of element 7 appears only when one of the inputs of element 8 has a logical zero. Let, for example, at the moment of changing the signal "Running a GTI at the output of element 4 there is a logical zero, at the output of element 5 - one and the output signal of the pulse generator a 0. In this

In the case of the inputs of the element 8 and the output of the element 7, "single signals are set. A zero signal at the output of element 7, which causes the switching off of the switching device, appears only if the value of the signal a is changed.

This way, the proposed device allows you to generate a series of pulses without distorting the first and last pulses.

Claims (1)

1. Alekseenko AG radio, 1971, p. 146, ris.5.53. Vshod GTI 3) t