Third order PLL with increased high frequency gain

Details Third order PLL with increased high frequency gain Third order PLL with increased high frequency gain

1982-07-19

1985-03-19

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 17, 331 25, 455260, H03L 708, H03L 710

Patent

active

045062323

ABSTRACT:
A third order phase-locked loop providing increased gain in the high frequency portion of a predefined bandwidth includes an oscillator providing a reference signal, a voltage controlled oscillator (VCO) providing a variable signal, and a phase detector for comparing the phase of the reference signal to the phase of the variable signal. The phase detector produces a difference signal for application to an input of the VCO to bring the variable signal into phase with the reference signal. First and second active amplifiers are connected in series between the output of the phase detector and the input to the VCO, operative to provide decreasing loop gain with increasing frequency at the rate of 18 db per octave at frequencies approaching the predefined bandwidth.

REFERENCES:
patent: 3740671 (1973-06-01), Crow et al.
patent: 4059805 (1977-11-01), de Laage de Meux et al.
patent: 4208635 (1980-06-01), Fazakerly et al.
patent: 4380743 (1983-04-01), Underhill et al.
Motal, G. W., "Continuous Control of Phase Locked Loop Bandwidth", NASA Tech. Briefs, Spring 1980, vol. 5, No. 1, p. 10.

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