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Detail
Registered SPREAD SPECTRUM CLOCK GENERATING CIRCUIT
- Inventors
- Seok Ju Yun, Kwon Jong-Kee, Kim Kwi Dong, Lee Hui Dong
- Application No.
- 13275753 (2011.10.18)
- Publication No.
- 20120105114 (2012.05.03)
- Registration No.
- 8446194 (2013.05.21)
- 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 spread spectrum clock generating circuit. The spread spectrum clock generating circuit includes: a phase detector receiving a reference frequency signal from the external and detecting a phase difference between the reference frequency signal and a frequency-divided signal; a voltage controlled oscillator outputting an oscillation signal corresponding to a detection result of the phase detector; a main divider generating the frequency-divided signal by dividing a frequency of the oscillation signal by a main dividing ratio; and a dividing ratio controller generating a variable count value, generating a sub dividing ratio by performing delta-sigma modulation according to the count value, and adjusting the main dividing ratio according to the sub dividing ratio.
- KSP Keywords
- Delta-Sigma Modulation, Frequency signal, Phase Difference, Reference frequency, Spread Spectrum Clock, Voltage controlled oscillator(VCO), delta-sigma, phase detector(PD), spread spectrum(SS), voltage controlled