Phase locked loop and voltage controlled oscillator thereof

Details Phase locked loop and voltage controlled oscillator thereof Phase locked loop and voltage controlled oscillator thereof

2009-11-05

2011-10-25

Johnson, Ryan (Department: 2817)

Oscillators

Ring oscillators

C331S017000, C331S03600C

Reexamination Certificate

active

08044729

ABSTRACT:
A phase locked loop (PLL) and a voltage controlled oscillator (VCO) thereof are provided. The VCO includes a ring oscillator circuit and a control circuit. The ring oscillator circuit is used for providing an output clock signal; and the control circuit is coupled to the ring oscillator circuit, and used for receiving an output voltage to respectively provide a first voltage-frequency gain and a second voltage-frequency gain so as to control a frequency of the output clock signal provided by the ring oscillator circuit, wherein the first voltage-frequency gain is larger than the second voltage-frequency gain.

REFERENCES:
patent: 6060953 (2000-05-01), Tsai
patent: 6462623 (2002-10-01), Horan et al.
patent: 7834708 (2010-11-01), Ren

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