Oscillators – Frequency stabilization
Reexamination Certificate
2005-01-11
2005-01-11
Mis, David (Department: 2817)
Oscillators
Frequency stabilization
C331S057000
Reexamination Certificate
active
06842082
ABSTRACT:
A programmable voltage-controlled oscillator includes a ring oscillator having a number of selectable delay stages, and a resistor value detection circuit configurable for coupling to an external resistor. The resistor value detection circuit includes at least one internal resistor and is operative to generate, based at least in part on a value of the external resistor, an output signal indicative of a value of the internal resistor. The output signal is utilizable in controlling an oscillation frequency of the ring oscillator based at least in part on selection of one or more of the selectable delay stages. The voltage-controlled oscillator may be utilized in a phase-locked loop of clock recovery circuit in an integrated circuit, and in numerous other applications.
REFERENCES:
patent: 6624710 (2003-09-01), Tian
U.S. patent application Ser. No. 10/452,661, Tan et al., filed May 30, 2003, “Reduced Complexity Linear Phase Detector.”
U.S. patent application Ser. No. 10/452,657, DeVeirman et al., filed May 30, 2003, “Phase-Locked Loop with Loop Select Signal Based Switching Between Frequency Detection and Phase Detection.”
U.S. patent application Ser. No. 10/452,329, Tan, filed May 30, 2003, “Resistor Value Detection Circuit.”
Agere Systems Inc.
Mis David
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