RF receivers and methods therefor

Details RF receivers and methods therefor RF receivers and methods therefor

2001-11-30

2008-12-23

Appiah, Charles N (Department: 2617)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S323000, C455S318000, C455S313000, C455S334000

Reexamination Certificate

active

07469136

ABSTRACT:
Methods in intermediate frequency and direct conversion receivers for reducing pre-selection filter leakage and harmonic coupling to a programmable voltage controlled oscillator by mixing a receive signal at a mixer having a mixer injection frequency outside a pre-selection filter passband. In some applications, the mixer injection frequency is conditionally moved outside the pre-selection filter passband. In other applications, signal gain is increased to compensate for any loss resulting from shifting the mixer injection frequency outside the pre-selection passband.

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Mouly et al., “The GSM System for Mobile Communications”, Cell & Sys., 1992, pp. 217 and 218.

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