Low-noise fine-frequency tuning

Details Low-noise fine-frequency tuning Low-noise fine-frequency tuning

2008-05-20

2008-05-20

Kinkead, Arnold (Department: 2817)

Oscillators

Combined with particular output coupling network

C331S176000, C331S17700V, C331S158000, C331S1170FE, C331S1170FE

Reexamination Certificate

active

07375597

ABSTRACT:
Circuits, methods, apparatus, and code that provide low-noise and high-resolution electronic circuit tuning. An exemplary embodiment of the present invention adjusts a capacitance value by pulse-width modulating a control voltage for a switch in series with a capacitor. The pulse-width-modulated control signal can be adjusted using entry values found in a lookup table, by using analog or digital control signals, or by using other appropriate methods. The capacitance value tunes a frequency response or characteristic of an electronic circuit. The response can be made to be insensitive to conditions such as temperature, power supply voltage, or processing.

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