Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural oscillators controlled
Patent
1996-10-11
1998-05-05
Grimm, Siegfried H.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural oscillators controlled
331 8, 331 10, 331 16, 331 17, 331 25, 345 3, 348537, H03L 708, G09G 512
Patent
active
057480443
ABSTRACT:
A dual VCO phase-locked loop in which one VCO forms part of a standard phase-locked loop, the VCO being controlled by a loop control voltage and its output being divided and compared with an input reference signal for maintaining lock. A second VCO is indirectly controlled by the loop control voltage and tracks the output of the first VCO within .+-.5% over combined variations in power supply voltage from 3.0 V to 3.6 V, in ambient temperature from 20.degree. C. to approximately 125.degree. C., and in manufacturing process variations over 5 process corners (typical, fast-fast, slow-slow, slow-fast and fast-slow). A control current is developed for the VCO forming part of the closed loop and is coupled to the second VCO using a current mirror. An offset current is combined at the second VCO with the coupled control current. The offset current is intentionally made a compensating function of the variations in power supply voltage, ambient temperature and manufacturing process.
REFERENCES:
patent: 4567448 (1986-01-01), Ikeda
patent: 4904955 (1990-02-01), Ley
Product Data Book, 86CM65 Aurora64V+ Dual Display Accelerator, Section 11: Flat Panel Interface, S3 Incorporated, Santa Clara, California (Jul. 1996) pp. 1-14.
Grimm Siegfried H.
Silicon Motion Inc.
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