Method and apparatus for tuning RF integrated LC filters

Details Method and apparatus for tuning RF integrated LC filters Method and apparatus for tuning RF integrated LC filters

2005-09-06

2005-09-06

Nguyen, Simon (Department: 2685)

Oscillators

Solid state active element oscillator

Transistors

C455S180300, C455S193200, C455S197200, C327S156000

Reexamination Certificate

active

06940358

ABSTRACT:
Using low impedance switches and coupling to a virtual ground, one or more capacitors are selectively switched into or out of an inductive-capacitive resonant circuit portion of an integrated circuit filter to alter the resonant frequency based on a phase difference between the resonant frequency and a reference frequency. The capacitors are sized for a sequence of total capacitances proceeding by halves or doubles between values corresponding to minimum and maximum desired frequency adjustments, allowing a binary count of pulses representative of the phase difference to address the correct combination of capacitors. An exact or ratioed replica of the inductive-capacitive resonant circuit, controlled by the same capacitance selection signal, may be used as a frequency-selective amplifier load or matching network, or to form a ladder filter.

REFERENCES:
patent: 5053723 (1991-10-01), Schemmel
patent: 5625325 (1997-04-01), Rotzoll et al.
patent: 6013958 (2000-01-01), Aytur
patent: 6069505 (2000-05-01), Babanezhad
patent: 6181218 (2001-01-01), Clark et al.
patent: 6211745 (2001-04-01), Mucke et al.
patent: 6236843 (2001-05-01), Goto
patent: 6686804 (2004-02-01), Adams et al.
patent: 6738601 (2004-05-01), Rofougaran et al.

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