SU1034010A1 - Time-to-code converter - Google Patents

Abstract

TIME CODE CONVERTER containing 1 (delay element whose input is connected to the first input - -.- iu .. -YK ,,., Element And, the second input of which is connected to the output of the delay element, and the output connected to the counter input characterized in that, in order to reduce the conversion time of the span expansion of the range of intervals, the second element AND and WE are entered into it, the first input of the second element AND is the input of the converter, the iteration input is connected to the output of the element NOT whose input is connected to the output of the first element And, the output of the second th AND gate is connected to the input of the delay element.

Description

W

WITH

C.O 4

ABOUT

ag f

The invention relates to measurement technology and can be used to measure the time intervals of the nanosecond range.

Closest to the proposed by the technical nature of the recirculation converter time-code of the nanosecond range, containing the OR element, the output of which is connected to the input of the first delay element, and the output of which is connected to the input of the AND element and the input of the second delay element, whose output is connected to the second input of the element And, the output of which is connected to the counter and the input of the OR element, and the second input of the OR element is the input of the converter.

The disadvantage of this converter is the low speed. And the fact that it does not allow measuring the duration exceeding the delay time of the first delay element.

The purpose of the invention is to reduce the conversion time and expand the range of convertible intervals,

The goal is achieved by the fact that the converter has a time code containing an element, a delay, the input of which is connected to the first input of the AND element, the second input of which is connected to the output of the delay element, and the output is connected to the input of the counter, the second AND element and the NOT element are entered The first input of the second element AND is the input of the transducer, the second input is connected to the output of the NOT element, the input of which is connected to the output of the first element AND of the output of the second element AND connected to the input of the delay element.

FIG. 1 shows a block diagram of a time code converter; in fig. 2 is a voltage chart in the nodes of the circuit.

The time code converter contains a delay element 1, an AND 2 counter 3 element, a NOT 4 element, an AND 5 element. The first input of an AND 5 element is an input of a time-code converter.

The measured pulse arrives at the input of an AND 5 element (Fig. 2c)), to the other input of which the level from the output of the NOT 4 element enters, the parallel passage of the measured pulse to the input of the delay element 1 and to the input of the And 2 element (Fig. 25). At the output of the element II 2 (Fig. 22.), a short pulse front appears, delayed relative to the front of the measured pulse over T (where D T is the delay provided by lagging element 1), inverting with the HE 4 element having the TG delay time. This short impulse causes AT

leveling

element input

And 5 from the output of the element NO 4 (Fig. 2cj), which leads to the appearance of the level O at the output of the element 5 and (firm 2-6) and at the output of the element 2, which is inverted by the element NOT 4 and the obus 1

it is leveling

on

the input element And 5, allowing the passage of the measured pulse through the element And 5. Next, the process is repeated. Counter 3 counts short pulses of duration, coming from the output element And 2.

The duration of the measured pulse is defined as

-By - M (lt1-t)

where N is the meter reading 3.

As an element of delay 1, an RF cable section is used, which makes it possible to adjust the delay of element 1 by changing the geometric length of the cable section.

In the proposed time-to-converter, the conversion time does not exceed the duration of the measured interval and the range of the measured time interval is not limited to the duration of the delay element. The converter can be fully implemented on digital microcircuits without the use of elements of analog technology, which will reduce the cost of setting up the converter and increase its reliability. Improvement of metrological characteristics is not associated with additional costs, since an increase in the accuracy of the converter is achieved by decreasing the sample rate of the DT transformation, which is easy to achieve by shortening the geometric length of the cable in the delay element.

Claims (1)

TIME-CODE CONVERTER containing a delay element, the input of which is connected to the first input of the AND element, the second input of which is connected to the output of the delay element, and the output is connected to the counter input,. characterized in that, in order to reduce the conversion time and expand the range of converted intervals, the second AND element and the NOT element are introduced into it, the first input of the second AND element being the converter input, the second input connected to the output of the NOT element, the input of which is connected to the output of the first And element, the output of the second And element is connected to the input of the delay element. FIG. 1