Patent ID: 7928806
Filing Date: 2011-04-19
Classification: H03L

Abstract:
1. A low voltage frequency synthesizer using a boosting method for a power supply voltage of a charge pump, comprising: a phase/frequency detector (PFD) that receives and compares a reference frequency and a feedback frequency to output a comparison signal; a charge pump that receives the comparison signal to output a current corresponding to the comparison signal; a low-pass filter (LPF) that generates a voltage corresponding to the output current of the charge pump; a voltage controlled oscillator (VCO) that receives the voltage of the LPF, amplifies the voltage to generate a boosting voltage, and outputs a frequency corresponding to the received voltage; and a DC converter that receives the boosting voltage of the VCO, converts the boosting voltage into a DC voltage, and applies the DC voltage as a power supply voltage of the charge pump.