SU371680A1 - PHASE-PULSE MODULATOR - Google Patents

Description

I

The invention relates to the field of radio engineering and can be used in information processing and automatic control systems.

Known modulators containing latitude-pulse converters, multivibrators and magnetic amplifiers.

The presence of magnetic amplifiers and transformers limits the frequency range of such devices.

The aim of the invention is to expand the frequency range of operation.

This is achieved by the fact that the phase-pulse modulator is made on integrated circuits and contains a series-connected multiplier, an integrator and a relay element, the integrator and a relay element are covered by negative feedback, the second input of the multiplier is connected to the output of the relay element, and the carrier source is connected to integrator input.

The drawing shows a block diagram of the proposed device.

The source of the modulating voltage is connected to the first input of the multiplier 2, the output of which is connected to the input of the integrator 3 connected in series with the relay element 4, for example, a trigger. The integrator and the relay element are covered by negative feedback from the output of the relay.

element to the input of the integrator. The second input of the multiplier 2 serves the voltage from the output of the relay element. The carrier source 5 is connected to the input of the integrator 5.

5 The modulator operates as follows. If the modulating voltage and the carrier voltage in the system of the integrator and the relay element covered by negative feedback are zero, oscillations with a period Tn are set.

t a - that)

i II willows

where T & L is the time constant and the static coefficient of the integrator amplifier. whether - hysteresis of the relay element.

The output voltage of the modulator t / out taken from the output of the relay element has a rectangular shape and is set to type 20 De:

  and sign-sin (og + f)

When used as a switch multiplier, the voltage at its output 25 is equal to the modulating voltage U, multiplied by +1 nl by -1, depending on the value of the signal in the m-function.

When a carrier voltage t / "is applied to the inputs of the modulator with a piezor period equal to T. and a modulating voltage t / M, the phase increment of the output voltage relative to the carrier is proportional to the amplitude of the modulating voltage.

F (i77 provided that

2 and If /

U:

(Uu ,,

(s)

Thus, when the modulating voltage is changed from -U to + (Y, the phase changes from O to.

Subject invention

A phase-pulse modulator containing a series-connected integrator and a relay element, for example, a trigger covered by negative feedback, a source of modulating voltage and a source of carrier, characterized in that, in order to expand the frequency range of operation, between the source of modulating voltage and the multiplier is switched on by the integrator, the second input of which is connected to the output of the relay element, and the source of the carrier is connected to the input of the integrator.