SU647842A2 - Phase-responce device - Google Patents

Description

(54) FEA SENSITIVE DEVICE

1 chr-kz) of his generator 3, arriving at its control input. At the output of Phase 6: Switch 2, a reference frequency signal is formed, modulated by the phase that is applied, to the input of the adder 1. To the other input of the adder 1, the phase of which is measured. The output of the adder 1 as a result

adding the reference (phase of the modulated) signal and the measured signal produces a signal modulated in phase and amplitude. The depth of the amplitude modulation is proportional to the phase overlap of the reference and measured signals, i.e. serves as a measure of phase difference reference and measured signals.

From the output of the accumulator 1, the amplitude-modulated signal is fed to the frequency doubler 5 directly and to the additional frequency doubler 12 through the phase inverter 11. The frequency doublers are identical non-linear elements whose characteristics can be approximated by a polynomial not higher than the third degree. Since the phase of the second harmonic at the output of the frequency doubler does not depend on whether the phase is equal to input-; O or 180, and the main interrupt of the interfering harmonics is nejpBoW and the third repeats the phase of the input signal, then after summing the signals from the output of the additional frequency doubler 12 shortly, the output of the frequency doubler 5 through the balance of the shading 9, on the additional adder 10, a second-amplitude signal of the i-code signal with a double amplitude is formed, and the components of the main interfering harmonics are suppressed. The depth of suppression is controlled by the attenuator 9.

From the output: the additional adder 10, the signal is fed to the input of the amplifier-limiter 6. At the input of the amplifier, the limiter forms a voltage proportional to the sign of the output signal of the additional adder. From the output of the amplifier-limiter, the signal enters the phase K0: t.№iyator 7, which switches the phase of the output signal of the pickup amplifier according to the voltage of the clock generator 3. The signal at the output of the phase switch 7 is a phase modulated signal . The signal from the output of the phase cocking switch 7 is fed to the control input of the key 8, which opens when a positive voltage is applied to the control input and passes the voltage coming to its signal output to the control input

input from the output of additional sum ator 10. Thus, in one half-period of the voltage of the synchronizing generator 3, the output of the key receives positive half-waves of the signal from

the output of the additional cyNtMaTopa, and in the other half-period of the voltage of the synchronizing generator, the output of the key receives the negative half-waves of the signal from the output of the additional adder. Since the output signal of the additional adder is modulated in amplitude synchronously with the frequency of the synchronizing generator, the constant component of the output switch with high accuracy is equal to the magnitude of the modulating signal, i.e. the magnitude of the phase, the shift between the reference and the measured signal from the output of the key 8 arriving at the filter

low frequency 4, in KOTOf dM is implemented. is the output filtering. In the proposed phase sensitive device, the influence of the frequency of the input signals on the accuracy of the phase measurement is reduced.

Claims (1)

Invention Formula Phase-sensitive device according to ed. St. 571872, so that, in order to reduce the influence of the frequency of the input signals on the accuracy of the phase measurement, you-. the frequency doubler stroke is connected to the key input and the input of the A-B amplifier 5 readers through a series connected attenuator and additional adder, and between the outputs of the main adder and another input of the Additional cooler are connected the series-connected phase inverter and an additional frequency &