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Registered PHASE LOCKED LOOP CIRCUIT INCLUDING AUTOMATIC FREQUENCY CONTROL CIRCUIT AND OPERATING METHOD THEREOF
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PHASE LOCKED LOOP CIRCUIT INCLUDING AUTOMATIC FREQUENCY CONTROL CIRCUIT AND OPERATING METHOD THEREOF
- Inventors
- Lee Hui Dong, Kim Kwi Dong, Seok Ju Yun, Kwon Jong-Kee, Cho Sang-Hyun
- Application No.
- 12976449 (2010.12.22)
- Publication No.
- 20120056654 (2012.03.08)
- Registration No.
- 8350608 (2013.01.08)
- Country
- UNITED STATES
- Project Code
- 10MB1700, Development of Analog Circuit Techniques for Mixed SoC based on 45nm CMOS Technology, Kwon Jong-Kee
- Abstract
- Provided is a PLL circuit including automatic frequency control circuit and an operating method thereof. The voltage controlled oscillator is primarily controlled by an automatic frequency control circuit, and is secondarily controlled by a loop filter. The voltage controlled oscillator outputs a coarsely-tuned oscillation signal when primarily controlled, and outputs a finely-tuned oscillation signal when secondarily controlled. The PLL circuit can have a quick frequency fixing time, and output the oscillation signal having a broad and stable frequency. Moreover, the noise characteristic of the PLL circuit is enhanced.