Communications receivers

Details Communications receivers Communications receivers

Filed on

1996-01-30

Date issued

1999-12-21

Examiner

Faile, Andrew I.

Patent Class

Telecommunications

SubClass

Receiver or analog modulated signal frequency converter

SubSubClass

Frequency modifying or conversion

Other Related Categories

455305, 455295, H04B 126

Type

Patent

Status

active

Patent number

060060816

Description

ABSTRACT:
A communications receiver such as an integrated zero IF receiver comprises an input for receiving an input signal and a zero IF frequency down conversion circuit coupled said input and constructed to provide quadrature related signals (I,Q) at a substantially zero intermediate frequency. In order to balance the signal paths, at least one capacitance in each of the quadrature related zero IF signal paths of the frequency down conversion circuit comprises at least two integrated capacitors connected in anti-parallel. By fabricating the integrated capacitances in this way the symmetry of the circuit is maintained which enhances significantly the second-order inter-modulation performance.

REFERENCES:
patent: 4953010 (1990-08-01), Cowley
patent: 4972275 (1990-11-01), Spitz et al.
patent: 5003621 (1991-03-01), Gailus
patent: 5034994 (1991-07-01), Muterspaugh et al.
patent: 5187809 (1993-02-01), Rich et al.
patent: 5208597 (1993-05-01), Early et al.
patent: 5260671 (1993-11-01), Iso et al.
patent: 5396656 (1995-03-01), Jasper et al.
patent: 5548840 (1996-08-01), Heck
patent: 5570036 (1996-10-01), Vagher
patent: 5604746 (1997-02-01), Oto
patent: 5613233 (1997-03-01), Vagher
patent: 5630228 (1997-05-01), Mittel
patent: 5809410 (1998-09-01), Stuebing et al.

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