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1. (WO2001005042) A TWO-PORT WITH A FREQUENCY-DEPENDENT NETWORK

Pub. No.:    WO/2001/005042    International Application No.:    PCT/EP2000/006368
Publication Date: Fri Jan 19 00:59:59 CET 2001 International Filing Date: Thu Jul 06 01:59:59 CEST 2000
IPC: H03F 1/32
H04B 1/04
H04B 1/12
Applicants: KONINKLIJKE PHILIPS ELECTRONICS N.V.
Inventors: THUIS, Robbert, C.
Title: A TWO-PORT WITH A FREQUENCY-DEPENDENT NETWORK
Abstract:
RF amplifiers used in communications systems exhibit backward intermodulation caused by non-linear amplification. Backward intermodulation of the transmit signal and an external signal, which reaches the output of the amplifier (2) through the antenna (4), results in an unwanted third-order intermodulation product that potentially interferes with the proper reception of the receive signal. The receive sensitivity of the communications system is adversely affected by this unwanted third-order intermodulation product. By mixing a second-order intermodulation component, caused by the same backward intermodulation, with the transmit signal, a compensation signal is created allowing the cancellation of the unwanted third-order intermodulation component.