Oscillators – With frequency calibration or testing
Reexamination Certificate
2006-06-26
2008-10-28
Pascal, Robert J. (Department: 2817)
Oscillators
With frequency calibration or testing
C331S016000, C331S179000, C327S157000
Reexamination Certificate
active
07443252
ABSTRACT:
A calibration circuit for voltage-controlled oscillator (VCO) includes a calibration bias generator, a VCO, a detection unit, a micro control unit, an adjuster unit, a phase-locked loop (PLL) unit, a control voltage detection unit, and a control switch set. The calibration bias generator outputs a first control voltage. The VCO outputs an oscillation frequency according to the first control voltage. The detection unit detects the oscillation frequency and outputs the detection result signal to the micro control unit. The micro control unit outputs an adjust signal according to the detection result signal. The adjuster unit receives the adjust signal voltage and adjusts the oscillation frequency output from the VCO according to the adjust signal voltage. The PLL unit outputs a second control voltage to the VCO. The control voltage detection unit outputs voltage-detection signal to the micro control unit, which outputs the adjust signal according to the voltage-detection signal.
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Hsieh Ping-Hsun
Hsu Min-Chieh
Peng Yuan-Tung
Tu Yih-Min
Jianq Chyun IP Office
Johnson Ryan J.
Novatek Microelectronics Corp.
Pascal Robert J.
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