SU1350627A1 - Microwave amplitude and phase meter - Google Patents

Abstract

The invention provides an increase in the accuracy of measurement of the amplitude and phase and an increase in labor productivity during measurements. The microwave amplification meter contains a modulator 1, a mixer 2, a controlled discrete microwave phase shifter (UDFP) 3, a modulating voltage generator 4, a band-pass filter 5, an amplifier 6, an amplitude detector 7, a synchronous detector 8, an integrator 9 with a reset, a comparator 10 ADC 11 with variable quantization step, analog switch 12, reference voltage sources 13 and 14, synchronization unit 15 and processing and display unit 16, consisting of memory blocks 17 and 18, multiplying DACs 19 and 20, controlled by discrete phase shifters 21 and 22, adder 23, driver 24 si usoidalnyh reference - voltage, meter 25, the amplitude and phase meter 26. At the output of mixer 2, a signal with a frequency UI, proportional in amplitude to the quadrature of the measured microwave signal, is formed. The process of measuring the quadrature of the microwave signal occurs in two cycles. In the first cycle, when the first quadrature is measured, the phase shift introduced by the PIDV 3 is zero and the reference signal is fed to the mixer 2 with the initial phase. In the second cycle, when measuring the second quadrature, the phase shift is equal to 90 °. The accuracy of measuring the quadrature of the microwave signal is increased by compensating for the losses of B UDVF 3 using ADC 11. 1 3.p. f-ly, 1 ill. sl oo ate o 05 yu

Description

one

The invention relates to a microwave measuring technique and can be used to measure the amplitude and phase of a signal, as well as in the study of radiating systems.

The purpose of the invention is to improve the accuracy of the measurement of amplitude and phase and improve the performance of measurements.

The drawing shows a structured electrical circuit of the microwave amplification meter.

The microwave amplifiers contains the module 1350627 In the first cycle, the phase shift introduced by the controlled discrete microwave phase shifter 3 is zero and the reference signal is fed to the input of the mixer 2 with the initial phase. From the output of the mixer 2, the signal with the frequency to, is fed to the input of the band-pass filter 5, tuned to this frequency, amplified by the amplifier 6, is fed to the inputs of the amplitude detector

and synchronous

detector 8, the reference signal for which is the signal from the output of the generator 4. At the output of the synchronous

The torus 1, the mixer 2, the controlled disk of the detector 8, the signal can have a microwave microwave phase shifter 3, a generating or negative field 4 of the modulating voltage, a cavity depending on the phase or an owl filter 5, amplifier 6, amplitude anti-phase of the reference and measuring capacitance detector 7, synchronous detector 8, integrator 9 with reset, comparator 10, analog-to-digital converter

Signals of frequency w,, which in turn is determined by the sign of the measured quadrature.

The detector 11 has a variable quantization pitch, an analog switch 12, the first 13 and second 14 sources of the reference voltage, the block 15 of the synchronizer 25. Thus, the options and the block 16 of processing and. indications, including the first 17 and second 18 memory blocks, the first 19 and second 20 multiplying digital-analog converters, the first 21 and second 22 control signals of the Torus 7 signal to the input and the definition of the sign of the measured quadrature and it corresponds to a certain digital logic level From the output of the amplitude, the detectible discrete phase shifters, the adder 23, the driver of the 24 sinusoidal reference voltages, the amplitude meters 25 and the phase 26.

Microwave amplifazometr works as follows.

The measured signal arriving at the measuring input of the microwave ampli-phase meter is modulated in modulator 1 by a low frequency signal u)., Generator 4 and fed to the input of mixer 2, to the second input of which the controlled microwave microwave phaser 3 is fed through the controlled discrete microwave phase shifter 3 -signal. At the output of mixer 2, a signal of frequency s is obtained, proportional in amplitude to the quadrature of the measured microwave signal. The process of measuring the quadrature of the microwave signal occurs in two cycles. The operation of the SEC amplampasometer is carried out by the block 15, which is a generator of time pulses, the duration and mutual position of which in time determine the nocx sequence of the corresponding operations performed by individual circuit elements.

10, loop 6, fed to the amplitude detector inputs

and synchronous

detector 8, the reference signal for which is the signal from the output of the generator 4. At the output of the synchronous

the detector 8, the signal can have a positive or negative gender depending on the in-phase or anti-phase of the reference and the measurement of

Signals of frequency w,, which in turn is determined by the sign of the measured quadrature.

The polarity of the signal is determined. And is brought to the logical levels of the diffracted elements with the help of the comparator 10. Thus, the operator 7 is received. The signal arrives at the input and determines the sign of the measured quadrature and corresponds to a certain digital logical level. From the output of amplitude detek

five

0

five

0

five

9, controlled by block 15, and further to the analog input of analog-digital converter 11. After the integration is completed, the integrator 9 is switched by the sync pulse from block 15 to the storage mode. The same pulse simultaneously starts analog-to-digital converter 11.

A reference voltage source 13 is connected to the input voltage of the analog-digital converter 11 using an analog switch 12, controlled by unit 15. Analog-to-digital converter 11 provides a change in the weight of the lower bit depending on the level of the reference voltage. The digital information from its output goes to the first input of block 16 and further to block 17, where the sign code of the measured quadrature is also supplied from the output of the comparator 10. Recording this information in block 17 is gated with a sync pulse generated by block 15. Digital code of the measured quadrature A cos i / represents the (n + l) -digit word, where the most significant (n + 1) -th bit is significant, and the remaining n bits are informational

digital converter 11),

In the second cycle, the measurement of the second square takes place. At the same time, by the control signal of the unit 15, the controlled discrete SECh phase shifter 3 switches to a state in which the phase shift introduced by it is equal to 90, and the reference signal is fed to the input of the mixer 2 with a phase different from the reference signal in the first cycle by 90.

When passing through a controlled discrete microwave phase shifter 3, the amplitude of the reference signal decreases, which leads to a decrease in the amplitude of the signal taken from the output of mixer 2, and, consequently, the measured quadrature value. The decrease in the magnitude of the measured quadrature is compensated by the fact that in the second cycle the onop-Z5 of the imager 24 is connected to the input of the reference voltage of the analog-digital converter 11 by an analog switch 12.

the voltage from the output of the source 14 of the reference voltage of magnitude B,

shifted in phase by 90 relative to the signal coming to the control input of the controlled discrete phase shifter 21. Output signal

moreover, In, 7

where B is the value

reference voltage source 13 in

the first tact. The magnitude of the reference multiplier of the digital-to-analog transform B is chosen so that by changing the quantization step to compensate for the decrease in the amplitude of the measured signal of the second quadrature A, s in f caused by a decrease in the reference microwave signal passing through the controlled discrete microwave phase shifter 3. The code of the measured signal The second quadrature is fed to the second input of block 16 and further to block 18.

Further digitalization of the quadrature information of the microwave signal to the analog is not synchronized with time and takes place as digital information is received.

From the outputs of block 17, the parallel amplitude code of the measured quadrature in the form of an n-bit word enters the digital inputs of a multiplying digital-analog converter 19, for which the analog reference signal is voltage A, jCosL02t, coming from the analog output of the controlled discrete phase shifter 21 , where AJ is a constant amplitude, Shock frequency, in general, cOj s,, or AjCos (u ,, t: + 180 °), which depends. from the sign code of the measured quadrature. Character code (n + 1) -th bit of a word from the output

input of controlled discrete phase shifter 21. The analog input of controlled phase shifter, atel 21 receives the voltage from one of the outputs of driver 24, which is a generator of sinusoidal signals with frequency Uj and constant amplitude ,. two outputs with a relative phase shift of the output signals 90. The output analog signal of the multiplying digital-to-analog converter 19 is

and qi AjCosio t After the end of the second measurement cycle, the amplitude code of the measured quadrature goes to the digital input of the multiplying digital-to-analog converter 20, and the quadrature sign code to the control input of the controlled discrete phase shifter 22. To the analog input of the controlled discrete phase shifter 22 from the second output

shifted in phase by 90 relative to the signal coming from the control input of the controlled discrete phase shifter 21. Output signal

35

developer 20 has the form

and A., sin h), t, At the output of the adder 23 we get

analog signal I

and J. KA A, cos (tOj with - Lf),

where K is the proportionality coefficient.

The amplitude and phase of the received signal 4Q is proportional to the amplitude and phase of the microwave signal and measured by gauges 25 and 26. The reference signal is the signal produced by the shaper 24. The frequency Wj is chosen randomly and is limited by the frequency characteristics of the elements used and the gauge 25 and 26. Upon completion of the formation of the signal Ui, block 15 generates a triggering

- ,. pulse for meters 25 and 26 si-nal.

Thus, a microwave amplification meter improves the accuracy of measuring the quadrature of a microwave signal due to

 compensation of losses in a controlled discrete SBS-phase shifter 3 using an analog-digital converter 1 G With variable quantization step and improve performance

measurements by providing direct digital amplitude and phase readouts.

Claims (1)

1. Microwave amplifiers containing a serially connected modulator, mixer, band-pass filter, amplifier and synchronous detector, modulating voltage generator connected to the modulating input of the modulator and the reference input of the synchronous detector, controlled by a discrete microwave phase shifter, whose output connected to the heterodyne input of the mixer, and the input is the reference input of the microwave amplification meter, also the analog-digital converter, the processing and display unit and the synchronization unit, the first and second outputs of which dineny respectively with the control inputs of the controllable digital microwave phase shifter, and an analog-digital converter, the input of the modulator is a measuring input microwave amplifazometra of m- lichayuschiys that, with tse If you increase measurement accuracy, the output of the amplifier is inputted through a series-connected amplitude detector and integrator with a reset connected to the input of an analog-digital converter whose output is connected to the first input of the processing and display unit, the output of the synchronous detector is inputted to the second input of the processing and display unit The analog-to-digital converter is made with a variable quantization step, while its support This input is connected to the output of the inputted analog switch, to the two inputs of which the first and second 45 and phase meters are connected, respectively. Editor P, Gereshi Compiled by M, Kromin Tehred L. Oliynyk Order 5283/47 Circulation 730 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, ul, Proektna, A 0 five five the reference voltage points, the second and third outputs of the synchronization unit are connected to respectively the integrator control inputs with a reset, the analog switch and the processing and display unit, 2, the microwave amplification meter according to claim 1, 1 is similar in that, in order to improve the performance of the measurements, the processing and display unit contains serially connected first memory block, the first multiplying digital-to-analog converter, adder and amplitude meter, connected in series the second memory block and the second multiplying digital-analog: converter, the output of which is connected to the second input of the adder, the first and second controlled discrete phase shifters, the inputs of which are connected respectively to the outputs of the fords irovatel sinusoidal reference voltage, outputs - to the reference inputs of the first and second multiplying digital to analog converters, and control inputs - outputs to the second respectively first and second blo dinen with memory. the memory, and the phase meter, the first input of which is connected to the output of the adder, and the second input - to the input of the second controlled discrete phase shifter, while the first input of the first memory block, which is the first input of the processing and display unit, is connected to The second input of the second memory block, the second input of the second memory block, which is the second input of the processing and display unit, the second input of the first and second memory blocks, the control input of the processing and display unit, is connected to the control inputs of the first and second memory blocks. ate amplitudes Proofreader S. Shekmar