SU1314456A1 - Time interval-to-digital converter - Google Patents

Abstract

The invention relates to a pulse technique and can be used in automatic control and information processing devices. The purpose of the invention is to improve the accuracy of converting a time interval to a code. The Converter contains a pulse generator 1, a pulse shaper 2, RS flip-flop 3, AND 4, 5 and 6 elements, counters 7 and 8, an OR 9 element, delay elements 10 and 11, a strobe shaper 12, performed on the RS flip-flop 13 and the element 14 delays, tires 15 and 16 Start and Stop respectively, groups 17 and 18 output tires. Improving the accuracy of the conversion is achieved by reducing the quantization error by introducing synchronization between the beginning of the converted time interval and filling it with 1 pulses, as well as by taking into account the pause between the last filling pulse and the end time of the time interval. 5 il. (L Start 15 L- / 7 Fil.G

Description

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The invention relates to a pulse technique and can be used in automatic control and information processing devices.

The purpose of the invention is to improve the accuracy of the conversion.

FIG. 1 is a block diagram of converter J in FIG. 2-5, timing diagrams explaining its operation.

The converter contains a generator of 1 pulses, a driver of 2 pulses, an RS flip-flop 3, the first 4, second 5 and third 6 elements AND, the first 7 and second 8 counters, an element OR 9 the first 10 and second 11 delay elements, a driver 12 strobe, made on RS trigger 13 and element 14 delay, tires 15 and 16 Start and Stop, respectively, the first 17 and second 18 groups of output tires.

The Converter operates as follows.

I

When a signal arrives at the bus

16 Stop trigger 3 is set to zero, closing element 4 and thus stopping the flow of pulses to counter 7. In addition, by the difference from one to zero of the signal at trigger output 3, driver 2 generates a pulse, arriving at the second input of element 5 and after delays on element 10 to the second input of element 6, the response of which depends on the duration of the pulses (s,) of generator 1, and the pause (o) between them of the pulse duration (fa,) of the driver, the delay of element 10 and the moment of arrival of the stop signal, For correct the operation of the transducer is necessary so that the oo sf: 0 ,. The delay time of element 10 is equal to half.

Assume that the Stop signal comes in the first quarter of the pause between the last generator pulse counted by counter 7 and the pulse following it (Fig. 2). In this case, the generator 1 pulses and the generator 2 output pulses delayed by element 10 do not match in time , at the outputs of the elements And 5 and 6, the signals are not formed and the readings of counters 7 and 8 do not change.

When the Stop signal arrives in the second and third quarters of the pause (fig.Z

6 2

and 4) the inputs of the element AND 6 simultaneously receive the pulse generator 1 and the pulse from the output of the delay element 10. At the same time, at the output of the element And 6 fop the pulse, the pulse sets the counter 8 to the position corresponding to 0.5 junior

counter 7. I

When the Stop signal arrives in the last quarter of a pause (Fig. 5), the pulses of the generator 1 and the former 2 simultaneously arrive at the inputs of the element And 5. At the same time, at the output of the element 5, a pulse is generated, which through the element 9 or 9 goes to the counter 7, increasing the time code recorded in it by one unit, which improves the accuracy of the conversion.

To ensure the formation of a pulse of generator 1, following in time after the end of the converted time interval, the trigger

13, the gate driver 12 is set to zero after the Stop signal on element 14 is equal to the period of the pulses of the generator 1. Therefore, the generator 1 with the help of the driver

12 starts synchronously with the start pulse, and is reset after a time equal to the period of the generator pulses 1, after the arrival of the stop signal, the delay Element 11 is intended

to eliminate the error occurring in the counter 7 (pulses), i.e. to skip the first pulse of the generator 1 after its start. In this case, the error does not occur not only in

younger, but also in subsequent bits of the device. The delay time is chosen equal to the pulse width of the generator 1.

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Claims (1)

Invention Formula The Converter time interval in the code containing the pulse generator, the output of which is connected to Q the first inputs of the first and second elements And, the outputs of which are connected to the first and second inputs of the element OR, the output of which is connected to the counting input of the first counter, the outputs  which are the first group of output busbars, the RS flip-flop, the R input of which is the bus stop of the converter, and the output is connected to the second input of the first And element, the first a delay element that differs from the fact that, in order to increase accuracy, a second counter, a pulse driver, a second delay element, a gate driver, made on an RS flip-flop and a delay element, a third AND element, and R - RS-trigger trigger input of the strobe is connected via a delay element to the bus Stop converter, S-input is combined with the input of the second delay element and connected to the Start bus of the converter, and the output is connected to the strobe Start Stop P rm P fpus.3 W 564 The main input of the pulse generator, the output of the second delay element is connected to the S input of the RS flip-flop, the output of which is connected to the input of the pulse generator, the output of which is connected directly to the second input of the second And element and through the first delay element to the first input of the third And element, the second the input of which is connected to the output of the pulse generator, and the output is connected to the counting input of the second counter, the outputs of which are the second group of output buses of the converter. rm P. FIG. 2 P P P P P R Start. n ftsyo five Compiled by Z. Moiseenko Editor M. Dylyn Tehred V. Kadar Order 2219/55 Circulation 902 Subscription VNIIPI USSR State Committee. for inventions to the discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorodr st. Design. four Proofreader M. Pojo