RU2494429C1 - Recirculating conversion method of single time intervals of nanosecond duration to digital code - Google Patents

Abstract

FIELD: measurement equipment.SUBSTANCE: recirculating conversion method of single time intervals of nanosecond duration to a digital code is based on recirculation in one recirculator of start and stop pulses of initial calibrated duration, which correspond to the beginning and the end of converted time interval, at that, with recirculation period of a stop pulse, initial calibrated duration, which is equal to T. Duration values of start and stop pulses of initial calibrated duration in each recirculation are left unchanged; recirculation period of start pulse of initial calibrated duration is chosen equal to T+?, where ? - discreteness of conversion; number of recirculations performed with the stop pulse of initial calibrated duration is calculated from the beginning of recirculation and till recirculating start and stop pulses coincide, and digital result of conversion is represented with the counted number of recirculations performed with the stop pulse of the initial calibrated duration.EFFECT: improving conversion reliability.

Description

The invention relates to information-measuring technology and can be used for digital conversion of single time intervals of nanosecond duration, specified by start and stop pulses, with nano- and subnanosecond discrete transformations in navigation, control, determination of integrated circuit parameters, study of various physical and technological processes.

There is a method of recirculating conversion of time intervals (VI) specified by start and stop pulses, based on their recirculation in one recirculator, and in each of the recirculations the duration of start and stop pulses increases by a calibrated value of τ, equal to the resolution of the conversion and counting the number perfect recirculation until the moment of coincidence of the recirculating pulses [1].

The disadvantage of this method is the long conversion time, due to the fact that the recirculation period must satisfy the condition T> 2t _Xmax , where t _Xmax is the largest value of the duration of the converted VI.

A known method (prototype) based on recirculation in one recirculator with a recirculation period T> t _{Xmax of} start and stop pulses of the initial calibrated duration corresponding to the beginning and end of the converted VI, with an increase in the initial calibrated start pulse duration by a calibrated value of the duration τ in each of the recirculations, and the stop pulse of the initial calibrated duration - without changing its duration in each of the recirculations, until the time of coincidence of the recirculating start and stop pulses and counting yvany number of recirculations committed stop-calibrated initial pulse duration [2].

The disadvantage of this method is the low reliability of the conversion associated with the increase (expansion) of the initial calibrated duration of the start pulse and the calculation of the digital conversion result.

The aim of the proposed method is to increase the reliability of the conversion.

This goal is achieved in that the start and stop pulses of the initial calibrated duration, corresponding to the beginning and end of the converted time interval, are recycled in one recirculator, moreover, with the period of recirculation T of the stop pulse of the initial calibrated duration, and the recirculation period of the start pulse of the initial calibrated durations are chosen equal to T + τ, where τ is the conversion resolution, the number of recirculations made by the stop pulse of the initial calibrated duration from the moment ala recycling and recycled until coincidence start and stop pulses, and digital conversion result are counted number of recirculations committed stop-calibrated initial pulse duration. That is, the operation of increasing the initial calibrated start pulse duration in the proposed method is absent, and there is also no operation for calculating the digital conversion result.

The essence of the method of recirculating conversion of single time intervals of nanosecond duration into a digital code is as follows.

Start and stop pulses of the initial calibrated duration t _H and t _K , corresponding to the beginning and end of the converted waveform, of duration t _X , are sent to the recirculator.

Start and stop pulses must have equal calibrated values of duration t _H = t _K > t _P + τ, where t _p is the total switching time of the recirculator logic elements. The start pulse t _{H is} subjected to recirculation with a period (T + τ), as a result, a monotonic sequence of pulses is generated in the recirculator

f _H (t) = f (t _H + n _H (T + τ)),

where n _H is the start pulse recirculation number.

Simultaneously, in the recirculation process with a recirculation period T of a stop pulse of the initial calibrated duration t _K , a monotonic pulse sequence is generated in the recirculator

f _K (t) = f (t _K + n _K T),

where the number of stop-pulse recirculations is n _K = n _H = n, and T> t _Xmax .

At the time point f _H (t) = f _K (t), that is, when the trailing edge of the recirculating start pulse coincides with the leading edge of the recirculating stop pulse, the count of the number of recirculation n of the stop pulse (or start pulse) of the initial calibrated duration, started from the moment they enter the recirculator, stops.

The conversion function of the proposed method has the form:

t _X = nτ,

where the range of digital change is the result of the transformation n∈ [1; N]), a N = t _Xmax / τ.

Conversion time

T _pr = t _Xmax + NT≈ (N + 1) t _Xmax

At the same time, in the case of the prototype method, t _X = t _H + nτ, which requires an additional operation of calculating the digital conversion result.

In the proposed method, there are no operations to increase the duration t _H in each of the recirculations and to calculate the digital conversion result, as in the case of the prototype method, and, therefore, the reliability of the conversion is increased. Thus, the goal of the proposed method is achieved.

Literature

1. A.S. USSR No. 654932, M. cl. G04F 10/00.

2. RF patent No. 2443007, M. cl. G04F 10/00.

Claims (1)

The method of recirculating conversion of single time intervals of nanosecond duration to a digital code based on the recirculation in one recirculator of start and stop pulses of the initial calibrated duration, corresponding to the beginning and end of the converted time interval, and with a period of recirculation of the stop pulse of the initial calibrated duration equal to T, characterized in that, in order to increase the reliability of the conversion, the duration of the start and stop pulses of the initial calibrated duration the tee in each recirculation is left unchanged, the recirculation period of the start pulse of the initial calibrated duration is chosen equal to T + τ, where τ is the conversion resolution, the number of recirculations made by the stop pulse of the initial calibrated duration is calculated from the moment the recirculation starts and until the recirculating start and stop pulses, and the digital conversion result is represented by the calculated number of recirculations made by the stop pulse of the initial calibrated duration.