SU1003011A1 - Time interval stroboscopic meter - Google Patents

Description

The invention relates to instrumentation and measurement technology and can be used to measure a periodic sequence of nano- and picosecond time intervals. A time interval meter is known that contains strobe pulse formers, stroboscopic mixers, generators, comparison blocks, trigger pulse formers using stroboscopic frequency conversion of the signal under study and measurement by pulse time conversion time between the instants of the conveyed signal reaching the specified reference levels Cl3. This stroboscopic time interval meter has insufficient accuracy and speed typical for pulse conversion time and C1F strobe frequency conversion. The closest to the technical essence of the invention is a time interval meter containing a beat signal detector, two crystal oscillators, two stroboscopic mixers, a driver strobe pulses, two amplifiers, control unit, two amplitude measurement units, two switches, two comparison units, two trigger, delay unit, trigger pulse shaper, and reference block 12. The disadvantages of the known time interval meter are low speed, resolution and accuracy of measurements, because for measuring with a resolution equal to At the time interval, a measurement time longer than pT is required, where T is the period of the strobe pulses, ut is the difference between the periods of the frequencies of the quartz oscillators, and n is the number of read points in the measured interval. The speed of time interval measurements is determined by the number of read points in the time interval being measured and inversely proportional to the required resolution. As the resolution increases, the measurement time increases proportionally. The low accuracy of the measurements is due to the use of time pulse, conversion and the absence of

statistical processing of measurement results.

The purpose of the invention is to increase the speed and accuracy of measurements.

The goal is achieved by having a stroboscopic time interval meter containing two stroboscopic mixers, the first inputs of which are connected to the corresponding input buses of the meter, the first and second amplitude measurement units, the outputs of which are connected to the first inputs of the first, respectively. the second and second comparison blocks, a crystal oscillator, the output of which is connected to the input of the trigger pulse generator, a gate driver, the output of which is connected to the second input of the first stroboscopic mixer, a second strobe pulse generator, a high frequency generator, a phase meter, two controllable delay units and two additional stroboscopic mixers, the first inputs of which are connected to the output of the high-frequency generator, and the outputs - to the inputs of the phase meter, the first inputs of the first and second control units The output delay is connected to the outputs of the first and second comparison units, the second inputs of which are connected to the outputs of the first and second stroboscopic mixers, respectively, and the output of the crystal oscillator is connected to the second inputs of the controllable delay units and the control amplitudes of the amplitude measurement blocks whose inputs are connected to the corresponding meter input buses, the output of the first controllable delay block through the first gate-gate driver is connected to the second input of the first additional c the throboscopic mixer, the output of the second controllable delay unit is connected via the second gate generator to the second input of the second stroboscopic mixer and the second input of the second additional stroboscopic mixer.

FIG. 1 shows a schematic of a stroboscopic meter for time intervals / in FIG. 2 - time diagrams.

The meter contains stroboscopic mixers 1 and 2, amplitude measurement units 3 and 4, strobe pulse generators 5 and 6, additional stroboscopic mixers 7 and 8, comparison units 9 and 10, crystal oscillator 11, controllable delay units 12 and 13, trigger pulses, a high frequency generator 15 and a phase meter 16.

The device works as follows.

The inputs of the amplitude measurement units 3 and 4 and the first inputs of the stroboscopic mixers 1 and 2 receive the signals under investigation (Fig. 2a, generated by the circuit (not shown in Fig. 1), which is triggered by the trigger pulse generator 14, the synchronized signal of the crystal oscillator 11 (Fig. 2b. The first inputs of the additional stroboscopic mixers 7 and 8 receive a high-frequency generator 15 (Fig. 2g). The second inputs of all the stroboscopic mixers are supplied with short strobe pulses (fig.2d, e) generated from the output signal of quartz second generator 11, delayed by blocks 12 and 13 controlled deceleration (Fig. 2c, d). Thus, the output pulses of each strobe-pulse generator simultaneously gates the signal of the high-frequency generator 15 and the instantaneous values of the signal under study, determined by the delays of the blocks 12 and 13. Controlled delays. The phase shift of the output signals of the blocks 12 and 13 of the controlled delay, from which strobe pulses are formed, is equal to

- “if -i a) (1

where - the frequency of the quartz oscillator 11; t is the delay time of the controlled delay unit 12) T2 is the delay time of the controlled delay unit 13.

The phase shift of the H signals at the output of additional stroboscopic mixers 7 and 8, measured by phase meter 16 (Fig. 2h, and), is equal to

  ,

(2

ABOUT)

gdet- - multiplication factor of phase shift, U) - high frequency generator frequency uj, Frequency „outputs of additional stroboscopic mixes7 and

equals

 uj - np.

: h) and

etc

Claims (2)

and theoretically has a maximum value of up. At the moments of time determined by the action of the front and cut of the signal of the crystal oscillator 11 on the control inputs of the amplitude measurement units 3 and 4, they measure and store the amplitude and zero levels of the input signal under study. After measuring and memorizing the levels in blocks 3 and 4 of the amplitude measurement, the amplitude of the studied signal, the signal (the difference of the measured levels) is determined and the corresponding levels of the beginning and end points of the interval are fixed. Their levels are set using the switch. In blocks 9 and 10 of the comparison, the sign and the level of the difference between the signals specified in blocks 3 and 4 of the measurement of the amplitudes and the signal values coming from the output of the stroboscopic mixers are determined. The output signals of the comparison blocks 9 and 10 are fed to the control inputs of the control delay blocks 12 and 13 and change the delay time t of the signal of the crystal oscillator 11 passing through them, from which the strobe pulses are formed until the input voltages of the blocks 9 are equal and 10 comparisons. Thus, the time binding of the gate pulses to the specified reference levels of the signals under study is performed, while the measured time interval between the specified reference levels becomes equal to the time interval between the gate pulses and equal to the difference of the delay times of the 12 and 13 controlled Delays 4- –T f em – 2 The phase shift measured by the phase meter 16 is related to the measured time interval by relations (1) and (2). When strobing a high-frequency generator 15 strobe signal, the temporal position of the bursts is related to the reading points of the Measured time interval, the outputs of the additional stroboscopic mixers 7 and 8 are formed from low-frequency voltages, the phase difference between which is determined by the measured time interval and the frequency ratio of the quartz oscillator 11 and the high frequency generator 15. Thus, when gating a high-frequency signal from the generator 15, the phase difference is multiplied m times, which is equivalent to increasing the resolution also m times. The measurement time of the time interval offered by the meter is 5-10 periods of strobe pulses to realize a temporary binding of strobe pulses to a predetermined ZERO reference level of the signal under study plus one period of the output frequency of additional stroboscopic mixers for measuring the phase shift proportional to the measured time interval. The period of the output signal of the additional stroboscopic mixers 7 and 8 according to equation (3) can be chosen commensurate with the period of the strobe pulses. Taking into account the fact that the proposed meter has a significantly smaller measurement time compared to the known and higher resolution, with a given measurement it can be allocated considerable time for statistical processing of measurement results) As a result, a much higher measurement accuracy is achieved. The proposed meter can be widely used in chip fabrication factories, instrument-making enterprises in the implementation of input control components of integrated circuits. A stroboscopic time interval meter containing two stroboscopic mixers, the first inputs of which are connected to the corresponding input tires of the meter, the first and second amplitude measurement units, the outputs of which are connected to the first inputs of the first and second blocks of the comparison, respectively, the crystal oscillator whose output is connected with the trigger pulse driver input, the gate driver, the output of which is connected to the second input of the first stroboscopic mixer, distinguishes This is due to the fact that, in order to increase speed and accuracy of measurements, a second strobe pulse generator, a high frequency generator, a phase meter, two controllable delay blocks and two additional stroboscopic mixers, the first inputs of which are connected to the output of the high frequency generator, are introduced into it. and the outputs to the inputs of the phase meter, the first inputs of the first and second controllable delay units are connected to the outputs of the first and second comparison blocks, respectively, the second inputs of which are connected to the outputs of the first and SECOND article respectively, the output of the crystal oscillator is connected to the second inputs of controllable delay units and the control inputs of amplitude measurement units, which are connected to the corresponding input meter buses, the output of the first controllable delay unit is connected to the second input of the first additional stroboscopic mixer via the first gate generator, the output of the second controllable delay unit is connected via the second gate driver to the second input of the second strobe and the second input of the second additional stroboscopic mixer. Sources of information taken into account during the examination 1. USSR author's certificate No. 600454, cl. G, 04 F 10/04, 1978. 2. USSR Author's Certificate No. 699439, cl. d 04 F 10/02, 1979.