Loop filter for use in a phase-locked loop

Details Loop filter for use in a phase-locked loop Loop filter for use in a phase-locked loop

2006-04-11

2006-04-11

Le, Dinh T. (Department: 2816)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

C331S025000, C327S157000, C327S156000, C375S376000

Reexamination Certificate

active

07026879

ABSTRACT:
An integrated circuit including at least one loop filter for use in a phase-locked loop, the loop filter including a resistive element and at least one metal-oxide-semiconductor (MOS) transistor configured as a capacitor having a first capacitance associated therewith. The MOS transistor is connected between a voltage source and an input of the loop filter via the resistive element. The loop filter further includes a bias circuit connected to the MOS transistor. The bias circuit is configured for maintaining a substantially constant reference voltage across the MOS transistor, the reference voltage being selected so as to bias the MOS transistor in a designated region of operation. In this manner, the first capacitance is substantially optimized per unit area.

REFERENCES:
patent: 6292061 (2001-09-01), Qu
patent: 6826246 (2004-11-01), Brown et al.
patent: 6828654 (2004-12-01), Tam et al.
patent: 2003/0124810 (2003-07-01), Tam et al.

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