Invention Application
- Patent Title: LOW VOLTAGE FREQUENCY SYNTHESIZER USING BOOSTING METHOD FOR POWER SUPPLY VOLTAGE OF CHARGE PUMP
- Patent Title (中): 使用充电泵电源电压升压方法的低电压频率合成器
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Application No.: US12561910Application Date: 2009-09-17
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Publication No.: US20100156542A1Publication Date: 2010-06-24
- Inventor: Hui Dong Lee , Kwi Dong Kim , Jong Kee Kwon , Jong Pil Hong , Sang Gug Lee
- Applicant: Hui Dong Lee , Kwi Dong Kim , Jong Kee Kwon , Jong Pil Hong , Sang Gug Lee
- Applicant Address: KR Daejeon KR Daejeon
- Assignee: Electronics and Telecommunications Research Institute,Korea Advanced Institute of Science and Technology
- Current Assignee: Electronics and Telecommunications Research Institute,Korea Advanced Institute of Science and Technology
- Current Assignee Address: KR Daejeon KR Daejeon
- Priority: KR10-2008-0129615 20081218; KR10-2009-0071284 20090803
- Main IPC: H03L7/08
- IPC: H03L7/08

Abstract:
Provided is a low voltage frequency synthesizer using a boosting method for a power supply voltage of a charge pump. The low voltage frequency synthesizer includes 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. Since the supply voltage of the charge pump is provided from the LC-circuit-based VCO, the frequency synthesizer has superior characteristics such as a wide locking range, low phase noise, and the prevention of performance degradation caused by an external environment or process variations.
Public/Granted literature
- US07928806B2 Low voltage frequency synthesizer using boosting method for power supply voltage of charge pump Public/Granted day:2011-04-19
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