SU1403076A1 - Four-quadrant analog multiplier or low-frequency voltages - Google Patents

Description

421) 4092U8 / 24-24 (22) 07/17/86 (46) 15.06.88, Bull. № 22 (72) A, H. Leontsev and A.G. Blue

(53) 681.335 (088.8)

(56) Bonch-Bruevich A.M. et al. Non-contact contact elements of self-tuning systems. M .: Mashinostroenie, 1967,

with. 124, Fig. 61.

USSR author's certificate number 1056215, class. G 06 G 7/161, 1981.

(54) ANALOG FOUR-QUADRADANT MAGNETIZER OF LOW-FREQUENCY VOLTAGE

(57) The invention relates to electrical computing devices.

and can be used in analog-computing machines, the purpose of

the invention is to improve the accuracy and enhancement of functionality by implementing the operation of multiplying by a function of the second signal multiplier. The analog four-quadrant multiplier of low-frequency voltages contains amplitude modulator 1, demodulator 2, control voltage generator 3, pulse-width modulator 4, pulse shaper 5, low-pass filter 6, band-pass filter 7, inputs of the first and second signals - factors 8 and 9, output 10. The operation of the multiplier is based on the pulse-width conversion of the first signal-factor and the amplitude conversion of the second signal-factor about 2 IL-.

CZ

The invention relates to electrical computing devices and can be used in analog computers.

The aim of the invention is to increase the accuracy and enhance the functional capabilities due to the implementation of the operation of multiplying by the functions of the second signal multiplier. Yu

FIG. 1 shows a functional diagram of an analog four-quadrant multiplier of low-frequency voltages; in fig. 2 - time diagrams of signals.

FIG. 1 denotes an amplitude modulator 1, a demodulator 2, a control voltage generator 3, a pulse-width modulator 4, a pulse shaper 5, a low-pass filter 6, 20 a band-pass filter 7, an input of the first signal-multiplier 8, an input of the second signal- multiplier 9j output 10.

None of figs. 2 are depicted; a is the signal at the first output of the generator 3; 25 signal at the second output of the generator 3; в - signal at input 9; the g-signal at the output of the amplitude modulator 1 ;, d is the signal at the input 8; e - signal to

PULSE-PULSE MODULATO-JQ output

ra 4; W - signal at the output of the pulse generator 5} 3 - signal at the output of the demodulator 2.

The analog quadruple multiplier of low-frequency aprons works as follows.

The generator of control voltages 3 generates two sequences of signals (Fig. 2a, b). The frequency of these signals must be at least Q than 5 times higher than the maximum frequency of the spectrum by multiplying 1x signals. The amplitude modulator 1 is used to convert the second signal multiplier from input 9 (Fig. 2c) to a triangular voltage (Fig. 2d), the amplitude of which is proportional to the magnitude of the second signal multiplier.

The signal from the output of the amplitude modulator 1 through the band-pass filter 7 is fed to the demodulator 2.

The first (analog signal from input 8 in pulse-width modulator 4 is converted into square-shaped pulses (Fig. 2e). At zero value of the first signal-factor, the pulse duration at the output of pulse-width modulator 4 is half the control pulses35

50

55

with

five

0

five

Q

Q d

five

50

55

and the temporary position of the pulses from the output of the pulse generator 5 coincides with the moment of transition by the output voltage from the second output of J. of the generator 3 to zero. The output signal of the pulse-width modulator 4 (Fig. 2e) is fed to the pulse shaper 5, which forms negative negative pulses on the negative front (Fig. 2g). The phase position of these pulses can vary from 0 to i 90 ° depending on the magnitude and sign of the first signal multiplier from input 8. Demodulator 2 converts the output voltage of the bandpass filter 7 into a stepwise voltage (Fig. 2h), the value of which is proportional to the voltage from the output of the amplitude modulator 1 (Fig. 2d) at the time of pulse from the output a pulse shaper 5 (Fig. 2g) .. The magnitude of the output voltage of the demodulator 2 is proportional to the product of the first and second signals from the input-multipliers 8 and 9.

Using the band-pass filter 7, it was possible to expand the functionality of the device. So, if you select the center frequency of the bandpass filter to be equal to the frequency of the signal from oscillator 3, then it is possible to multiply one signal-multiplier by the sine from another signal-multiplier. If the band-pass filter 7 is performed with a band equivalent to a low-pass filter, then it is possible to multiply one signal-multiplier by the anti-log from another signal-multiplier.

Claims (1)

Invention Formula ) An analogue four-quadrant multiplier of low-frequency voltages-: SRI containing an amplitude modulator, a pulse-width modulator whose information input is the input of the first multiplier multiplier signal, a control voltage generator, characterized by the fact that in order to increase accuracy and enhancement of functionality due to the implementation of the operation of multiplying by the functions of the second signal-multiplier, it is entered Q L P P AT -Iphia .2