Patent ID: 8674772
Filing Date: 2014-03-18
Classification: H03L

Abstract:
1. An oscillating signal generator utilized in a phase-locked loop (PLL), comprising: an oscillating circuit, arranged to generate an oscillating signal according to at least a first control signal; and a control circuit, arranged to adjust the first control signal according to a temperature; wherein the first control signal is tuned between a first boundary and a second boundary, and when the temperature is closer to a first temperature boundary than a second temperature boundary, the control circuit is arranged to make the first control signal to be closer to the first boundary than the second boundary such that the oscillating circuit outputs the oscillating signal of a predetermined frequency in a locked mode of the PLL, and the oscillating circuit comprises: a varactor, controlled by the first control signal in the locked mode and controlled by a second control signal in a calibration mode of the PLL; and a switching-capacitor array, controlled by a third control signal in the calibration mode and controlled by a fourth control signal in the locked mode.