Circuit for reducing second order intermodulation

Details Circuit for reducing second order intermodulation Circuit for reducing second order intermodulation

2004-12-15

2008-09-02

Le, Thanh C (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S318000, C455S323000

Reexamination Certificate

active

07421263

ABSTRACT:
A circuit for calibrating a second order intercept point (IP2) and for reducing second order intermodulation (IM2) includes a common mode feedback circuit and a load impedance operatively connected between first and second output terminals of a mixer in a direct conversion receiver. The common mode feedback circuit reduces second order intermodulation of the mixer by detecting an output voltage of the mixer and adjusting a gain of the mixer. The IP2 is controlled by controlling the gain of the common mode feedback circuit. The second order intermodulation (IM2) may be reduced and the linearity of a device may be enhanced.

REFERENCES:
patent: 3940703 (1976-02-01), Hekimian et al.
patent: 5930696 (1999-07-01), Tzuang et al.
patent: 6242963 (2001-06-01), Su et al.
patent: 6316996 (2001-11-01), Puotiniemi
patent: 6438365 (2002-08-01), Balteanu
patent: 6535725 (2003-03-01), Hatcher et al.
patent: 2003/0129958 (2003-07-01), Behzad
patent: 2006/0148438 (2006-07-01), Manku
patent: 00204591 (1999-03-01), None
patent: 2002-0033978 (2002-05-01), None
patent: WO 02/33812 (2002-04-01), None
Baker, Jacob R., Li, Harry W., Boyce, David E. “CMOS Circuit Design, Layout, and Simulation,” IEEE, ISBN 0-7803-3416-7, 1998, pp. 666-668.

Affiliated with

Also associated with

Rating

Circuit for reducing second order intermodulation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit for reducing second order intermodulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit for reducing second order intermodulation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3989602