Gain control circuits for voltage controlled oscillators

Details Gain control circuits for voltage controlled oscillators Gain control circuits for voltage controlled oscillators

2006-01-10

2006-01-10

Chang, Joseph (Department: 2817)

Oscillators

With particular source of power or bias voltage

C331S182000, C331S176000, C327S103000

Reexamination Certificate

active

06985045

ABSTRACT:
A gain controlled voltage controlled oscillator. A current controlled oscillator is adapted to provide an output signal oscillating at a frequency controllable by controlling a current applied thereto. A first current source provides a first control current controllable by controlling a voltage applied thereto that has a predetermined range. A first current mirror is adapted to mirror the control current to the current controlled oscillator. A second current source is adapted to provide a second control current for mirroring to the current controlled oscillator by the first current mirror when the control voltage is in a low portion of the range.

REFERENCES:
patent: 5515012 (1996-05-01), Bhushan et al.
patent: 5523723 (1996-06-01), Arcus et al.
patent: 6664861 (2003-12-01), Murakami
patent: 6828832 (2004-12-01), Gabillard
Gardner, Floyd M., “Charge-Pump Phase-Lock Loops,”IEEE Transactions on Communications, vol. COM-28, No. 11, Nov. 1980, pp. 1849-1858.

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