Phase-locked loop type frequency synthesizer having improved loop response

Abstract From the Canadian patent

A frequency synthesizer using a phase-locked loop is disclosed. The frequency synthesis is accomplished by a closed loop arrangement comprising: a reference oscillator, a phase detector, a programmable counter a, phase detector, a loop filter, a voltage controlled oscillator (VCO), and a frequency translator. The phase detector is supplied with a reference signal from the reference oscillator and a signal from the programmable counter, and compares phases of the two signals. A frequency translator is provided in a manner to receive the signal from the VCO and downward translate the frequency of the signal received. The output of the frequency translator is fed to the programmable counter …