Digital and analog IM3 product compensation circuits for an RF receiver

Patent metadata

Field	Value
Publication number	US-8971834-B2
Application number	US-95223710-A
Country	US
Kind code	B2
Filing date	Nov 23, 2010
Priority date	May 19, 2006
Publication date	Mar 3, 2015
Grant date	Mar 3, 2015

Abstract

Third-order intermodulation products (IM3) are attenuated in RF receivers by providing a typical main signal path and a parallel auxiliary signal path in which the IM3 products are accentuated, and the output from the main signal path is adaptively filtered to attenuate the IM3 products. In one embodiment, a multirate filter bank (MRFB) with asymmetric analysis and synthesis sections is used to detect and isolate the IM3 products. In another embodiment an analog nonlinear term generator is placed at the front of the auxiliary signal path. The analog nonlinear term generator takes advantage of the nonlinearities of a differential MOSFET circuit and a multiplier to extract the IM3 products in the RF input signal. The outputs of the main signal path and the auxiliary signal path are inputs to a complex least mean squares filter to attenuate the IM3 products in the resulting signal.

First claim

We claim:

1. A RF section of a receiver for receiving quadrature modulated RF signals comprising:
a) a first RF circuit configured to receive a RF signal received at a first RF signal input terminal, configured to down convert and digitize said received RF signal and configured to provide a first set of digitized down-converted I and Q signals at a first set of output terminals;
b) a second RF circuit configured to receive said RF signal, said second RF circuit comprising an ana…

Assignees

• Keehr Edward
• Hajimiri Seyed Ali
• California Inst Of Techn

Inventors

• Keehr Edward
• Hajimiri Seyed Ali

Classifications

• H04B1/1018 Primary

  Electricity · mapped topic