Intermediate frequency tuner

Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit

Reexamination Certificate

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Details

C455S334000, C455S296000, C455S317000, C455S226100, C455S226200

Reexamination Certificate

active

07155196

ABSTRACT:
The present invention is a method and apparatus for optimizing performance of a transceiver selecting and processing an intermediate frequency free of significant interference, such as noise. A frequency band may be scanned to detect interference upon which an intermediate frequency free of significant interference may be selected. This may enhance performance of the receiver by reducing the effects of noise. Additionally, perrformance may be further optimized by adjusting the passband of the filter such that the center of the passband matches the selected intermediate frequency. This may provide stability as centering of the passband may account for process, voltage and temperature variations and errors. Further, performance may be enhanced by ensuring desirable signal attributes are passed through the filter.

REFERENCES:
patent: 4408322 (1983-10-01), Chadwick et al.
patent: 5175880 (1992-12-01), Brown
patent: 5325204 (1994-06-01), Scarpa
patent: 5475871 (1995-12-01), Shalev et al.
patent: 5487186 (1996-01-01), Scarpa
patent: 6219376 (2001-04-01), Zhodzishsky et al.
patent: 6324390 (2001-11-01), Elder et al.
patent: 6532358 (2003-03-01), Earls et al.
patent: 6836105 (2004-12-01), Zou

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