SU1022069A1 - Shaping device for phase meter - Google Patents

Description

The invention relates to a radio metering technique and is intended to convert an input harmonic signal that varies over a wide range of amplitudes, into a periodic pulse sequence whose edges and slopes are rigidly attached to n-transitions of the input signal through a zero level. Known forming device containing the amplifier-limiter and shaper short pulses. Such a device is characterized by a wide range of operating frequencies, the simplicity of the hardware implementation 1. However, when the amplitude of the input signal changes, a significant phase-to-amplitude error occurs. The closest in technical essence to the invention is a shaping device for a phase meter, comprising a series-connected adjustable phase shifter, an amplifier-limiter and a short pulse shaper, as well as a series-connected strobe converter, amplifier, synchronous detector and matching unit, with the first inputs of the adjustable phase shifter and the stroboscopic the converter is connected to the input of the device, the outputs of the short pulse shaper are connected to two they stroboscopic converter inputs and outputs are device yield matching block connected to the second input of the adjustable phase shifter, the output limiter amplifier connected to the second input of the synchronous detector. This device automatically compensates for the phase shift introduced by the amplifier-limiting device as the input signal amplitude changes, thereby ensuring a small phase-amplitude error f 2J. The disadvantage of it - a narrow range of operating frequencies. The purpose of the invention is to expand the operating frequency range of the shaping device. The goal is achieved in that a device containing an amplifier-limiter, a stroboscopic converter, whose input is connected to the device's input, an amplifier and a short pulse shaper connected by an output to another input of the stroboscopic converter, the output of which is connected to the amplifier's input, introduces a generator first element EXCLUDING OR, a control unit with a second pinch element connected to its output, successively connected to the first delay element, pulse shaper, three a generator, a summing counter, and a code comparison unit, a standardizer standardized in series, a second element EXCLUSIVE OR, a first and a second reversible counter, the input of which sets the zero of the first reversible counter to be connected to the outlet of the second delay element, the counting input of the second reversible counter to the output of the block control, the bits of the second reversible counter are connected to the second inputs of the code comparison unit connected by the output to the second trigger input, the counting inputs of the summing counter and the first reversible counter is connected to the generator output, the input of the standardizer of levels is connected to the amplifier output, the output of the limiting amplifier is connected to the input of the first delay element, the inputs of the first element EXCESS CEE OR are connected respectively to the outputs of the first delay element and the trigger, and its output is With the output of the device, connected to the inputs of the control unit, the short pulse driver and the second input of the second element EXCLUSIVE OR, the input of the amplifier-limiter is connected to the input of the device. Figure 1 shows the structural diagram of the forming device; figure 2 - timing charts of his work. FoE 1 The tamper device contains a series-connected amplifier limiter 1, the first delay element 2, the pulse shaper 3, trigger 4, summing counter 5, and code comparison block b, the first element 7 EXCLUSIVE OR connected to the first. delay element -2 and trigger 4, serially connected strobe converter 8, amplifier 9, standardizer 10 levels, second element 11 EXCLUSIVE OR, 12 and second 13 reversible counters, generator 14, connected with summing counter 5 and first reversive counter to 12 , shaper .15 short pulses, serially connected control block 16 and second delay element 17 connected to first 12 and BTopbJM 13 reversing RF & h, input of control block 16 connected to first and elements 7 and 11 of the SOUTH OR pulse shaper 15, connected to a stroboscopic transducer 8. The raVota of this device is based on the automatic compensation of the phase shift introduced by the amplifier-limiter 1 by adjusting the temporal position of the fronts and decays of the output signal -keeping. The control action is formed by the sign of the phase of the output signal of the stroboscopic transform of the body 8, which reads the instantaneous values of the input harmonic signal at times, corresponding to the fronts and decays of the output signal of the device. The phase of the output signal of the strobe converter 8 coincides with the instantaneous phase of the input signal, i.e. its own error is negligible. 3fo is due to the good frequency properties of stroboscopic transducers having a bandwidth of up to several tens of gigahertz and the fact that in the established mode the instantaneous values of the input signals of the 6 read points have small values and change slightly relative to zero, which virtually eliminates the additional phase-amplitude error strobe transducer. Thus, using the stroboscopic converter 8, the phases of the output and input signals of the device are compared. Since the output signal of the amplifier-limiter 1 is always delayed relative to the input signal, in order to compensate for this delay, a negative physical connection is not realizable. holding Oo3Tc iy in this device, the regulation of the temporal position of the edges and decays of the output signal of the device is carried out relative to the zero transitions of the input signal in its next half-period, i.e. with a time delay of 7/2. This is achieved by introducing an additional fixed delay by a quarter of the signal period (T / 4) and an adjustable delay at the O-T / 2 time, which is equivalent to an O & t gear equal to T / 2 ± T / 4. With this ka. with respect to zero-ne; the inputs of the input signal can be adjusted in both directions tia a quarter of the signal period. In the steady state delay, the delay will be equal to T / 2 --fe CW, where i C, about the delay time of the amplifier-limiter 1. So, the output signal of the amplifier limiter 1 (FIG. 2 S) is delayed by the time approximately equal to T / 4, the percussion element 2 delays (fig. 3 pulses are fed to the flash gun, where it converts into a sequence of short and 1 pulses, graded to its fronts and decays (fig. 2, which periodically set the trigger (FIG. 2E) in a single state. In this case, the reset signal is removed; sa from the installation input. About counter 5, to which the output of trigger 4 is connected, and it starts counting pulses (Fig. 2e) arriving at it from generator 14, the follow-up period of which is equal to -fco. With the help of block 6 code comparison, the current code of the sum of the hands of counter 5 is compared with the output the code of the second reversible counter 13 and at the moment of their equality the pulse from the output of the code comparison unit 6 (fkg.2zh) sets the trigger 4 to the zero state (Fig. 2E) and resets the summing counter 5 to zero. The output pulse of the trigger 4 (Fig. 23) together with the output signal of the first delay element 2 (Fig. 2-6) is fed to the first element 7 EXCLUSIVE OR. On the output of this element, which is the output of the device, a signal is formed (Fig. 2), delayed relative to the output signal of the first delay element 2 by a time equal to the duration of the output pulse of the trigger 4 and determined by the output code of the second reversible counter 13. Thus , using the pulse shaper 3, trigger 4, summing counter 5, block b of code comparison and second reversing counter 13, the device’s adjustable output delay is achieved within half the signal period: Initial the output kbda of the second reversible counter 13 is set close to a quarter of the period of the highest-frequency signal (elements of the initial preset of the counter are not shown). In this case, the delay of the output signal of the device relative to the input harmonic signal will be less than T / 2 and the output signal of the stroboscopic converter 8 (Fig. 2 l), read instantaneous values of the input signal (.fig. 2a) at the moments of the pulses from the outputs of the imager 15 short pulses ( Fig. 2l), bound to the fronts and decays of the device's output signal, will coincide with it in phase. This signal, amplified by amplifier 9 and standardized in levels by a standardizer of 10 levels (Fig. 2v), together with the output signal of the device, is fed to the second element 11 SOURCE OR. The bi-signal of this element of FIG. 2 “) controls the operation mode of the first reversible counter 12: with a logical signal level equal to zero, it works for summation, with a logical signal level equal to one, for subtraction. If the device and the stroboscopic converter 8 signals are in phase, then for most of the period this counter will work to sum the counting pulses from the generator 14 and the number registered by it will have a positive sign. The time during which the accumulation of information about the phase sign is made is determined by the control unit 16, which periodically, through the second delay element 17, resets the first reversible counter 12 to zero with a period multiple of the integer number of signal periods (Fig. 2i) control follows a period equal to one signal period). At the same time, depending on the sign of the output code of the first reversible counter 12, it increases G if the code is 0) or reduces (if code O) the content of the second reversible counter 13 by one. The sign of the output code of the first reversing counter 12 corresponding to the phase sign of the output signal of the stroboscopic converter , is determined by the state of the most senior blank bit of this counter :, if the content of the bit is zero - the code is positive, the unit is negative (Figure 2o).

So, if the output signals of the device and the stroboscopic converter 8 are in phase, the contents of the second reversing counter 13 are increased by one and the output signal of the device is shifted in time by one period of the generator 14. If the sign of the phase of the stroboscopic converter does not change, then the next poll the control unit 16 will increase the content of the second reversing counter 13 by another unit, which will increase the delay of the output signal of the device (Fig. 25) by one more generator period 14. This clause The process will continue until the total delay of the output: signal of the device reaches the T / 2 value, which. corresponds to the code of the second reversible counter 13 (in units of time) equal to (T / 4 fc z.u-o), the duration of the output pulse of the trigger 4 (Fig.2E. A further increase in the delay will change the sign of the phase of the output signal of the stroboscopic converter, to change the sign of the output code of the first reversible counter 12. As a result, the control unit 16 reduces the content of the reversing counter 13 by one and reduces the output delay for the period of the generator 14. This will again change the sign of the phase of the output signal st oboskopicheskogo transducer 8 reversed and appearance of new regulating effect. As a result, there comes a dynamic equilibrium in which the output phase of the device up to the discreteness error will coincide with the phase of the input signal (presence of a constant 180 degree phase shift is not fundamental.

When the frequency or amplitude of the input signal changes, the delay time of the on-amp limiting amplifier, which will be monitored by the control system, changes. The speed of the perturbing effect is determined by the control unit 16, which determines the polling part of the first reversing counter 12. The sensor is mismatch, and the frequency of formation of the corresponding regulatory actions. To increase the system speed, the polling rate needs to be increased, producing them, for example, in each signal period (Fig. 2i). However, this reduces the noise immunity of the device, since the determined phase sign and the corresponding regulating effect will largely depend on the noise shifting the zero point of the harmonic signal acting on the input of the stroboscopic converter 8. This will lead to an increase in the fluctuations and decays of the output signal of the device. If the survey is performed through several signal periods, then in the first reversible counter 12 there will be an averaging of the sign of the phase of the output signal of the stroboscopic converter 8, and the information on the sign of the phase read from the other will be less susceptible to noise, than e) the number of averaged signal periods.

Since the compensation of the phase shift introduced by the amplifier-limiter is carried out by adjusting the temporal position of its output signal with the help of wideband circuits, this device can operate in a wide frequency range - from units and fractions of hertz to units of megahertz - without any switching; the upper boundary is determined by the speed of the element base used.

Thus, due to the introduction of new elements and connections, the frequency cap-arr of the shaping device expands to tens to hundreds of times with a small ypolBHe phase-amplitude error of tenths to hundredths of a degree.

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Claims (1)

FORMING DEVICE FOR PHASOMETER, containing amplifier-limiter, stroboscopic converter, the input of which is connected to the input of the device, amplifier and driver of short pulses, connected. The output to the other input of the stroboscopic converter, the output of which is connected to the input of the amplifier, is further related to the fact that, in order to expand the operating frequency range, a generator is introduced into it, the first element is EXCLUSIVE OR, block controls with a second delay element connected to its output, a first delay element connected in series, a pulse shaper, a trigger, a summing counter and a code comparison unit, connected in series with standardized levels, the second element is EXCLUSIVE OR, the first and the second reversible counters, the input of setting the zero of the first reversible counter connected to the output of the second delay element, the counting input of the second reversing counter connected to the output of the control unit, the outputs of the discharges of the second reversing counter connected to the second inputs of the code comparison unit, connected by the output to the second input of the trigger, the counting inputs of the summing _hour counter and the first reversible counter are connected to the output of the generator ®, the input of the level standardizer is connected to the output of the amplifier, the output of the amplifier - the limiter is connected to the input of the first delay element, the inputs of the first element are EXCLUSIVELY OR connected to the outputs of the first delay element and trigger, and its output, which is the output of the device, is connected to the inputs of the control unit, the shaper of short pulses and the second input of the second element EXCLUSIVE OR, the input of the amplifier-limiter is connected to the input of the device. 1022069 A