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1. (WO2003063338) DIRECT CONVERSION OF LOW POWER HIGH LINEARITY RECEIVER

Pub. No.:    WO/2003/063338    International Application No.:    PCT/US2003/001060
Publication Date: Jul 31, 2003 International Filing Date: Jan 15, 2003
IPC: H03F 1/34
H04B 1/10
H04B 1/16
Applicants: SONY ELECTRONICS INC.
Inventors: WIECK, Christopher, P.
Title: DIRECT CONVERSION OF LOW POWER HIGH LINEARITY RECEIVER
Abstract:
A radio frequency receiver includes an amplifier (1303, 1305) and a detector (1306) that produces a bias control signal indicating the level of the signal environment in which the receiver is currently operating. A bias generator sets the bias level of the amplifier according to the bias control signal, where the bias level tends to increase as the signal level increases. Further, the receiver includes a first circuit (1303, 1305) adapted to receive a radio frequency input signal, the circuit having an adjustable bias level, a bias control having more than one level of control for generating a bias control signal based upon a base-band signal (I, Q) for controlling the first circuit and generating an output signal; and an alternative bypass switch (702) across the first circuit so as to send a DC signal corresponding to the total power generated by said feedback means.