Error amplifier for multiple frequency oscillator control

Details Error amplifier for multiple frequency oscillator control Error amplifier for multiple frequency oscillator control

1991-10-24

1992-12-01

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 10, 331 15, 331 17, 331 20, 331 25, 358158, H03L 7093, H04N 505

Patent

active

051682460

ABSTRACT:
A multiple frequency scan oscillator control system includes a phase locked loop operative upon a scan oscillator to provide phase and frequency synchronization thereof to a periodic reference signal. A static phase error correction is operative to provide adjustment of the free-running or static frequency of the scan oscillator. An error amplifier includes a pair of intercoupled differential amplifier configurations one having a constant current source and the other having a frequency dependent current source which responds to a frequency dependent bias current to alter amplifier gain. A threshold detection circuit includes a differential amplifier pair coupled to a pair of switching circuits for establishing a threshold action in response to system error voltage to indicate large magnitude error voltages and signal the need for free-running frequency adjustment of the oscillator.

REFERENCES:
patent: 4568888 (1986-02-01), Kimura et al.

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