Feedback loop for LC VCO

Details Feedback loop for LC VCO Feedback loop for LC VCO

2006-04-11

2006-04-11

Chang, Joseph (Department: 2817)

Oscillators

Amplitude control or stabilization

Automatic

C331S109000, C331S1170FE

Reexamination Certificate

active

07026883

ABSTRACT:
A voltage-controlled oscillator includes an inductor capacitor (LC) tank; a drive circuit having a current source; and a feedback loop circuit. The feedback loop includes a peak detect circuit to generate a peak detect voltage; a reference voltage generator to generate a single reference voltage; and an operational amplifier, coupled to the peak detect circuit and the reference voltage generator, to generate an analog bias signal to adjust a current of the current source.

REFERENCES:
patent: 6064277 (2000-05-01), Gilbert
patent: 6278338 (2001-08-01), Jansson
patent: 6838952 (2005-01-01), Ramet
patent: 6909336 (2005-06-01), Rajagopalan et al.
patent: 2003/0025566 (2003-02-01), Rogers

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