Pulse generator with independent phase adjustment. Scheme, description

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Pulse generator with independent phase adjustment. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Digital technology

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In a phase locked loop circuit, it is often necessary to have a signal generator whose phase can be adjusted independently of other parameters. A circuit is proposed, consisting of a 555 timer and several discrete components, which is a pulse generator with independent and smooth phase control ranging from 0 to 180 °.

Rice. 1 (click to enlarge)

Timer U1 (fig. 1) with transistor Q1 and capacitor C1 generates a sawtooth signal, the extreme values of which are voltages Vcc/3 and 2Vcc/3 (fig. 2). Each period of the sawtooth signal corresponds to a short pulse at the output of U1. This pulse switches the trigger Uz-a, which generates the reference signal QA. The signal from the output of the comparator, which compares the sawtooth signal with the reference voltage on the engine of the variable resistor R4, switches the Hc-b trigger, which generates QB pulses shifted in phase relative to the reference ones.

Pulse generator with independent phase control
Fig. 2

This phase shift is linearly dependent on the reference voltage at the non-inverting comparator input U2, and the position of the R4 slider can be calibrated in phase units, with Vcc/3 corresponding to 0° and 2Vcc/3 to 180°. Since the flip-flop has two outputs, QB and QB, it is possible to receive a signal from the circuit both with a phase lead and a lag relative to the reference.

Author: Roberta Tovar Medina; Publication: N. Bolshakov, rf.atnn.ru

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