Process tracking limiter for VCO control voltages

Details Process tracking limiter for VCO control voltages Process tracking limiter for VCO control voltages

2006-06-13

2006-06-13

Pascal, Robert (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S066000, C331S176000, C331S183000

Reexamination Certificate

active

07061332

ABSTRACT:
A control voltage window generator that tracks process, voltage supply, and temperature variations for a voltage controlled oscillator includes: a first transistor of a first conductivity type coupled between a supply voltage node and an upper control voltage node; and a second transistor of a second conductivity type coupled to the upper control voltage node to compensate for process variations in devices of the first conductivity type. Additionally, a target pull-in voltage generator includes circuitry for providing a pull-in control voltage that will always be inside the control voltage window, and also tracks process, voltage supply, and temperature variations.

REFERENCES:
patent: 5719533 (1998-02-01), Shibuya et al.
patent: 5783956 (1998-07-01), Ooishi
patent: 6191660 (2001-02-01), Mar et al.
patent: 6885873 (2005-04-01), Ravi et al.
John G. Maneatis, “Low-Jitter Process-Independent DLL and PLL Based on Self-Biased Techniques” IEEE Journal of Solid-State Circuits vol. 31, No. 11, Nov. 1996, pp. 1723-1732.

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