Self-biased voltage controlled oscillator (VCO) method and appar

Details Self-biased voltage controlled oscillator (VCO) method and appar Self-biased voltage controlled oscillator (VCO) method and appar

1998-01-26

1999-11-16

Kinkead, Arnold

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 10, 331 1A, 331177R, 331185, 327159, 327160, H03L 708, H03L 7085

Patent

active

059865148

ABSTRACT:
A method and apparatus for biasing the voltage controlled oscillator (VCO) (110) of a Phase Locked Loop (PLL) (100) includes a bias circuit (114) providing a peak minimum/maximum voltage detector (202) tied to the control line (116) of the PLL (100). During operation, the detector (202) detects a minimum or maximum voltage on the VCO control line (116) as the bias control voltage (118) applied to the VCO (110) is varied. Detection of such a minimum or maximum voltage is equivalent to the detection of a minimum or a maximum frequency, which in turn equates to the detection of an optimal bias condition for noise.

REFERENCES:
patent: 4667170 (1987-05-01), Lofgren et al.
patent: 5375148 (1994-12-01), Parker et al.

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