Phase-locked loop and method for operating the same

Details Phase-locked loop and method for operating the same Phase-locked loop and method for operating the same

2011-03-15

2011-03-15

Chang, Joseph (Department: 2817)

Oscillators

With frequency calibration or testing

C331S016000, C331S017000

Reexamination Certificate

active

07907022

ABSTRACT:
A phase-locked loop (PLL) system generates an oscillator signal based on an input reference signal. A calibration circuit generates a calibration current, and a voltage-to-current converter converts a control voltage into a first current. A current-controlled oscillator generates the oscillator signal based on the first current and the calibration current. A charge pump circuit, which is connected to a phase detector, the voltage-to-current converter, and the calibration circuit, generates a charge pump current based on the first current and the calibration current. The charge pump current is used to generate the control voltage based on an error signal.

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Yu-Jen Lai et al., An Agile VCO Frequency Calibration Technique for a 10-GHz CMOS PLL, IEEE Journal of Solid State Circuits vol. 42, No.2, Feb. 2007.

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