SU492886A1 - Pulse width multiplying device - Google Patents

Description

(54) PULSE-PULSE-ADDITIONAL DEVICE of the body comparator 2. Between these | the inputs and the common point of the signal are turned on, i the transistor switches 3 and 4, which are controlled by the output signal of the comparator 6. The keys 3 and 4 work in antiphase. The output signal of the multiplier is removed from the output of 14 additional Compara-. torus 2. The multiplying device works hardly blowing way. In the absence of input signals, the integrator 5 and the comparator 6 operate in the self-oscillatory mode as a re-selection generator. At the exit, in. Tegrator 5 generates a sawtooth symmetrical voltage, and the output of the comparator 6 is a square-shaped voltage. The additional comparator 2 switches four times during the voltage period of the comparator 6. It switches twice when the comparator 6 switches, which switches the keys 3 and 4. And switches twice due to a change in the sign of the voltage at one of its inputs when the voltage passes integrator output through zero. Thus, in the course of an additional comparator, two pairs of alternating opposite polar pulses are formed over a period. In the absence of input signals, the relative length of the pulse durations at the output of comparator 2 is zero. If the input signals X and Jf are fed to the input of the integrator and comparator, the following changes will occur in the operation of the circuit. The rate of change of voltage at the output of the integrator will be (and + X) with a positive and

1 ((J; () with negative voltage)

The FDI at the output of comparator 6. The thresholds of operation of comparator 6 also change and become equal, respectively.

() and ();

where + and - are the voltage at the output of the comparator 6;

+ Ij - threshold of the comparator 6;

T is the integrator time constant 5.

If there are input signals at the output of the additional comparator 2, four rectangular pulses of various duration are formed during the period of the voltage of the comparator 6. The durations of these pulses are equal to: -

40

Subject invention

I Pulse width multiplier device containing keys, input source and pulse width modulator, consisting of a series-connected integrator, whose input

Another input source and key comparator are connected,. characterized in that, in order to obtain the HI.I duration of the input signal, proportional to the product of the input signals, an additional comparator is introduced, the inputs of which are connected to the integrator's output and through keys to the comparator's output, to the inverting input of which the first input signal is connected. Q-V T, gT We define the relative duration l 3 positive ch. T.-, negative U pulses over a period of teiiepiipy voltage X Thus, the relative duration of different polarity pulses on the output of the additional comparator 2 turns out to be proportional to the product of the input signals. If one stabilizes the lap amplitude at the output of the additional comparator 2, then the average value of the voltage at its output will be proportional to the product of the input signals.