Circuit for generating spread spectrum clock

Details Circuit for generating spread spectrum clock Circuit for generating spread spectrum clock

2007-01-23

2007-01-23

Lee, Benny (Department: 2817)

Oscillators

Electrical noise or random wave generator

C331S016000, C375S130000

Reexamination Certificate

active

10820691

ABSTRACT:
Circuit for generating a spread spectrum clock (CGSSC) that employs a mechanism to modulate the input voltage (V_ctrl) to the VCO to achieve dithering. The CGSSC includes a voltage controller oscillator (VCO) that generates an output signal (F_out). The VCO includes an input coupled to a voltage control node for receiving a voltage signal and an output for generating a clock signal that has a frequency dependent on the received voltage signal. A VCO input voltage modulation mechanism (VIVMM) is coupled to the voltage control node (V_ctrl) for modulating or adjusting the voltage at the VCO input voltage node in a controlled manner to generate a spread spectrum clock.

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“Charge-Pump Phase-Lock Loops” Floyd M. Gardner IEEE Trans. Comm. vol. COM-28, pp. 1849-1858.

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