Fast settling phase lock loop

Details Fast settling phase lock loop Fast settling phase lock loop

1988-08-19

1990-06-26

Pascal, Robert J.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Transistorized controls

331 17, 331 25, H03L 700

Patent

active

049375369

ABSTRACT:
A phase lock loop frequency synthesizer for providing a synthesized frequency signal employing a modified adaptive loop construction having parallel feedback paths about a loop amplifier. A normal feedback path having a narrow bandwidth characteristic includes a feedback capacitor having one end connected to electrical ground via a controlled switch and a second feedback path having a wide bandwidth characteristic with a capacitor also connected across the amplifier. Upon the variation of an incoming reference signal, the controlled switch connects the normal feedback capacitor to ground permitting the wide bandwidth feedback path to rapidly settle the loop while charging the feedback capacitor of the normal feedback path. Upon opening the controlled switch, the narrow bandwidth feedback path completes the charging of the feedback capacitor of the normal feedback loop settling the loop to the steady state condition while enhancing the settling time.

REFERENCES:
patent: 4752749 (1988-06-01), Moger
Josefsberg, Stable and Fast PLL Switches Loop Bandwidths, Electronics, vol. 55, No. 5, Mar. 10, 1982.

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