Circuit with two mutually synchronising VCO's - has two identical phase locked loops, each with oscillator phase discriminator, and loop filter.

摘要

The circuit has two identical phase locked loops (K,K'), each giving a definite amplification for DC voltage. The phase control loops are coupled via connecting lines between the junction points of two oscillators (VCO1,VCO2) and two phase discriminators (PD1,PD2) of the two phase locked loops, with a summation phase twist of 180 deg.. Thus, the two oscillators have a common frequency and constant phase difference after an oscillation start time period with at least partly overlapping full region. The circuit has pref. a working point control such that the oscillator control voltages are averaged and then the working point of an operational amplifier, allocated to the loop filter (TP1,TP2) is controlled. USE/ADVANTAGE - For directional radio couplers. Simple design for mutual synchronisation.