SU1367139A1 - Calibrator generator of time intervals - Google Patents

Abstract

The invention relates to a pulse technique and can be used, but for a precise time delay of pulses when creating accurate automated time-setting and measurement systems. The aim of the invention is to increase accuracy. To achieve this goal, a comparator 21 and a phase-to-frequency converter 13 are added to the time interval generator-calibrator containing drivers 14, 15, and 16, trigger 17, coincidence elements 18 and 19, and time master unit 20. The device also contains a reference generator 1, controlled divider, frequency dividers 2 and 3, phase detectors 4 and 5, mixers 6 and 7, adjustable generators briters 8 and 9, shapers 10 and 11 pulses and digital indicator 12. Phase converter operation - the code occurs using the phase shift algorithm - temporary and interval - the number of pulses-digit code. 1 il. with

Description

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The invention relates to a pulsed technique and can be used for precision delay of pulses and for creating accurate automatized time of master and measuring systems.

The purpose of the invention is to improve accuracy.

The drawing shows a block diagram of the generator-calibrator time intervals.

The device contains a reference generator 1, controlled dividers 2 and 3 frequencies, phase detectors 4 and 5, mixers 6 and 7, adjustable generators 8 and 9, drivers 10 and 11 pulses, digital indicator 12 converter 13 phase - code that includes drivers 14 , 15 and 16, the trigger 17, the elements 18 and 19 matches, and the time driver unit 20, the comparator 21.

The output of the reference generator 1 is connected to the synchronous inputs of dividers 2 and 3 and to the first inputs of mixers 6 and 7, the outputs of which are connected to the first inputs of phase detectors 4 and 5, the second inputs of which are connected to the outputs of dividers 2 and 3, and you to the control inputs generators 8 and 9, the output of the generator 8 is connected directly to the second input of the mixer 6 and through the driver 10 to the first output of the device, the output of the generator 9 is connected directly to the second input of the mixer 7 and through the driver 11 to the second output of the device, mix 6 is connected to the first input of the converter 13, the second input of which is connected to the output of the mixer 7, and the third input to the output of the generator 1, the information outputs of the converter 13 are connected to the first group of inputs of the comparator 21, the control input of which is connected to the output of the converter 13, and the second group of inputs - with the inputs of the time shift code, the digital indicator inputs 1 2 and the information inputs of the divider 2, the control inputs of the dividers 2 and 3 are connected to the corresponding outputs of the comparator 21.

where f is the frequency of the reference oscillator 1, and the sign of the summation or subtraction is determined by the selected frequency conversion algorithm in the PLL system. At the same time at the outputs

Transducer 13 may be transformers 10 and 11 set to, for example, as follows.

The inputs of the Converter 13 through the formers 14 and 15 are connected to the inputs of the trigger a 17, the output of which

retry time shift bt ex

. 2T

 h

R

0

through the elements 18 and 19 coincidence is connected to the input of the counter 16, the outputs of which are information outputs of the converter 13, the third (clock) input of the converter 13. is connected to the second input of the element 18 and the input time of the master unit 20, the first output of which is connected to the second input of the element 19, and the second output of the unit 20 is connected to the second input of the counter 16 and at the same time serves as the (clock) output of the converter 13.

The device works as follows.

Generator 1, controlled dividers 2 and 3, and time shift code inputs form a software-controlled low-frequency phase calibrator with discrete phase shift adjustment at outputs of dividers 2 and 3 by means of a software presetting of divider 2 with respect to unit 5. phase increment ± csz and the value of the specified phase shift tf are defined as

C | 9 12ir / N; C |) i 2nT / N,

And - the division factor in blocks 2 and 3;

n is the number of specified discretes (Laz.

The phase calibrator signals are fed to the inputs of phase detectors 4 and 5 of a two-channel phase-locked loop (PLL) system via secondary beats, which is formed by blocks. 1, 2, 4, 6, 8 and 10, constituting the first channel, and blocks 1, 3, 5, 7, 9, and 11, constituting the second channel of the PLL, the PLL transfers the specified phase shift to the signals of high-frequency adjustable oscillators 8 and 9, having the same frequency G „

0

Where

five

0

five

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8.9

 f, ± f, / n.

where f is the frequency of the reference oscillator 1, and the sign of the summation or subtraction is determined by the selected frequency conversion algorithm in the PLL system. At the same time at the outputs

55 drivers 10 and 11 is given by discrete time shift bt ek

. 2T

V, 9

3

where Tg 1 / fg, is the signature period of the generators 8 and 9.

The range of time shifts is equal to the period Tgq, the sampling adjustment of the time shift corresponds to Vj and is equal to Tgq / N.

The drift correction of a given time shift of the output signals of the formers 10 and 1 is performed as follows.

The converter 13 phase-code converts the phase shift of the output signals of the mixers 6, 7 into the digital code B, corresponding to the code A specified on the external control bus and recorded in the digital indicator 12, In the comparator 21, the set code A and the measured code B are compared when entering the clock pulse with the converter to the input of the comparator 21, In the initial state AB, therefore, the output signals of the comparator 21 are equal to zero. When analogue channel drift or malfunction occurs in a low-frequency phase calibrator, code B differs from code A, so in case A B, the clocking single pulse from the output of converter 13 appears at one output of the comparator 21p and at BА it is at the other. These pulses are then sent to the control inputs of dividers 2 and 3 and produce a discrete automatic correction of the analog drift and other errors of the device and, thus, ensure a constant equality of the AB codes at the inputs of the KONT parameter 21.

The operation of the transducer 13 phase - code B occurs according to the phase-to-shear algorithm — time interval — number of pulses — digital code. For L & Toro from the signals of the intermediate frequency from the outputs of mixers 6 and 7 in. shaper 14 and 15 at the moments of crossing the zero, short pulses are produced, triggering trigger 17 in start-stop mode, output pulses of trigger 17, the duration of which is proportional to the measured phase shift, passage element 18, are filled with generator pulses 1. Element 19 passes from the output of the element 18 to the input of the counter 16 a certain number of bursts of pulses in the flow of the averaging time specified by block 20. The counter 16 counts the average number of pulses

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15 20 25 30 35 40 45 50 55

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In a pack, corresponding to the intended phase shift 5, it gives the measurement result in the code of the digital code B. Synchrosh: the operation of the counter 1–16 to the comparator 21 is performed, h with a clock pulse of the unit 20.

Formula 1 acquisition

A time calibrator generator containing a reference generator whose output is connected to the synchronous inputs of the first and second controlled frequency dividers and the first inputs of the first and second mixers whose outputs are connected to the first inputs of the first and second phase detectors, respectively, the second inputs of which are connected to the outputs of the corresponding frequency dividers, and the outputs of the first and second phase detectors are connected to the control inputs of the first and second adjustable oscillators, respectively; the output of the first the adjustable generator is connected to the second input of the first mixer directly and through the first pulse former to the first output of the device, the output of the second adjustable generator ™ is connected directly to the second input of the second mixer and through the second pulse shaper to the second output of the device, –switch, first and second the outputs of which are connected respectively to the first and second inputs of the reversible counter, the outputs of which are connected to the inputs of the digital indicator, characterized in that, With increased accuracy, a phase converter is entered into it - a code, a comparator, the first and second elements OR, and the output of the first mixer is connected to the first input of the converter; phase - the code, the second input of which is connected to the output of the second mixer, and the third input - to the output of the reference generator, information outputs of the converter phase - the code is connected to the first group of the inputs of the comparator, the control input of which is connected to the output of the phase converter - the code, and the second group of inputs - to the outputs of the reversible counter, the first and second the outputs of the comparator are connected to the first inputs of the first and second SHS elements whose outputs are connected

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To the control inputs, respectively, the switch dyes are connected to the second of the first and second controlled delimiters, respectively, of the first and frequency tel, the first and second output of the second S1I elements.

Claims (1)

Claim 10 Generator-calibrator time intervals containing a reference generator, the output of which is connected to the clock inputs of the first and second controlled frequency dividers and the first 15 inputs of the first and second mixers, the outputs of which are connected to the first inputs of the first and second phase detectors, the second inputs of which are connected to the outputs of the respective frequency dividers, and the outputs of the first and second phase detectors are connected to the control inputs of the first and second tunable generators, 25 the output of the first tunable generator is connected to the second input of the first mixer directly and through the first pulse shaper to the first output of the device, 30, the output of the second tunable generator is connected directly to the second input of the second mixer and through the second pulse shaper to the second output of the device, 35 switch, the first and second outputs of which are connected respectively to the first and second inputs of a reversible counter, the outputs of which are connected to the inputs of a digital indicator — 40 ra, characterized in that, in order to improve accuracy, a phase code converter, a comparator, the first and the second OR element, the output of the first 45 'mixer connected to the first input of the phase converter — a code, the second input of which is connected to the output of the second mixer, and the third input with the output of the reference generator, information outputs of the conversion The phase-code code is connected to the first group of inputs of the comparator, the control input of which is connected to the output of the phase-code converter, and the second group of inputs to the outputs of the reversible counter, the first and second outputs of the comparator are connected to the first inputs of the first and second elements OR, the outputs of which connected to the control inputs of the first and second controlled frequency dividers, respectively, the first and second outputs of the switch are connected to the second inputs of the first and second OR elements, respectively.