Split channel receiver with very low second order...

Details Split channel receiver with very low second order... Split channel receiver with very low second order...

2008-02-08

2011-12-06

Payne, David C. (Department: 2611)

Pulse or digital communications

Receivers

C330S250000, C330S288000, C331S132000

Reexamination Certificate

active

08073078

ABSTRACT:
A high performance radio frequency receiver includes an isolated transconductance amplifier with large binary and stepped gain control range, controlled impedance, and enhanced blocker immunity, for amplifying and converting a radio frequency signal to multiple electrically isolated currents; a pulse generator for generating in-phase and quadrature pulses; a crossover correction circuit and pulse shaper for controlling a crossover threshold of the pulses and interaction between in-phase and quadrature mixers; and a double balanced mixer for combining the RF signal with the pulses to generate an intermediate frequency or baseband zero intermediate frequency current-mode signal. The intermediate frequency signal and second order harmonics may be filtered with a high frequency low pass filter and a current injected complex direct-coupled filter. IIP2 calibration of the in-phase and quadrature channels may be optimized using the isolated transconductance amplifier.

REFERENCES:
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patent: 7177616 (2007-02-01), Connell et al.
patent: 2004/0203479 (2004-10-01), Lin
patent: 2005/0118975 (2005-06-01), Ismail
patent: 2005/0174167 (2005-08-01), Vilander et al.
patent: 2007/0132500 (2007-06-01), Embabi et al.
patent: 2008/0175307 (2008-07-01), Brunn et al.
U.S. Appl. No. 12/021,534, filed Jan. 29, 2008, Kaczman et al.
Sacchi et al., “A 15 mW, 70 kHz 1 / ƒ Corner Direct Conversation CMOS Receiver”, IEEE 2003 Custom Integrated Circuits Conference, 2003, pp. 459-462.

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