Voltage controlled digital analog oscillator and frequency...

Details Voltage controlled digital analog oscillator and frequency... Voltage controlled digital analog oscillator and frequency...

2004-06-22

2008-10-07

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S034000, C331S17700V, C331S167000, C331S17700V, C331S1170FE, C331S1170FE

Reexamination Certificate

active

07432768

ABSTRACT:
Provided are a voltage controlled digital analog oscillator and a frequency synthesizer using the same, the oscillator comprising an oscillator having a frequency of an output signal being determined by a voltage inputted to an analog input end and a digital value inputted to a digital input end; and a digital tuner for comparing the voltage inputted to the analog input end to first and second threshold voltages and changing the digital value inputted to the digital input end according to the result, whereby it is possible to obtain a broadband frequency output with less noise.

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Chi-Wa Lo et al, “A 1.5-V 900-MHz Monolithic CMOS Fast-Switching Frequency Synthesizer for Wireless Applications,” 2000 Symposium on VLSI Circuits Digest of Technical Papers, pp. 238-241.
Frank Herzel et al, “An Integrated CMOS PLL for Low-Jitter Applications,” IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, vol. 49, No. 6, Jun. 2002, pp. 427-429.
Tsung-Hsien Lin et al, “A 900MHz, 2.5mA CMOS Frequency Synthesizer with an Automatic SC Tuning Loop,” Electrical Engineering Department, University of California, Los Angeles CA 90095-1594, pp. 375-378.
Yido Koo et al, “A Fully-Integrated CMOS Frequency Synthesizer with Charge-Averaging Charge Pump and Dual-Path Loop Filter for PCS- and Cellular-CDMA Wireless Systems,” 2001 Symposium on VLSI Circuits Digest of Technical Papers, pp. 43-46.
Tsung-Hsien Lin et al, “A 900MHz, 2.5mA CMOS Frequency Synthesizer with an Automatic SC Tuning Loop,” Electrical Engineering Department, University of California, Los Angeles CA 90095-1594, pp 375-378, date unknown.

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