Active LC band pass filter

Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression

Reexamination Certificate

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Details

C327S553000

Reexamination Certificate

active

07639071

ABSTRACT:
An active LC band pass filter10includes a single LC pair and a plurality of active amplifiers providing a number of separate resonance circuits. The active amplifiers compensate ohmic losses, high frequency skin effects, and high frequency radiation. Each circuit has a resonance frequency that is adjustable by changing only the parameters of one or more active amplifiers. The filter10has a very high adjustable quality value Q, very low shape factor S, a relatively high signal-to-noise ratio, and a very large voltage gain that increases with frequency. High frequency performance is not affected by the quality of the LC pair, being limited only by the high frequency performance of the amplifier components. Also disclosed is a method for processing an electronic signal using the active LC band pass filter10.

REFERENCES:
patent: 4496859 (1985-01-01), Crooks
patent: 4659995 (1987-04-01), Feistel
patent: 5006810 (1991-04-01), Popescu
patent: 5038328 (1991-08-01), Brunius
patent: 5142580 (1992-08-01), Neil
patent: 6157248 (2000-12-01), Minami et al.
patent: 1019990063245 (1999-07-01), None
patent: 03023958 (2003-03-01), None
International Search Report and the Written Opinion of the International Searching Authority, or the Declaration; Oct. 25, 2007.
Written Opinion of the International Preliminary Examining Authority; Dec. 29, 2008.

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