Method for reducing the 2 nd order intermodulation level of...

Details Method for reducing the 2 nd order intermodulation level of... Method for reducing the 2 nd order intermodulation level of...

2006-09-08

2009-06-02

Vo, Nguyen (Department: 2618)

Telecommunications

Transmitter

Noise or interference elimination

C455S295000

Reexamination Certificate

active

07542737

ABSTRACT:
A transconducting device includes at least one transistor having a control electrode for receiving an input signal whose frequency spectrum contains two different frequencies, an output electrode for delivering an output signal, and a third electrode. The transconducting device further includes a voltage source for delivering a DC reference voltage, and a feedback controller for feedback-controlling the voltage on the third electrode to the DC reference voltage using a negative feedback loop. The negative feedback loop includes resistive damping, connects the third electrode and the control electrode, and has an open-loop gain greater than unity at a frequency equal to the frequency separation between the two different frequencies.

REFERENCES:
patent: 5115206 (1992-05-01), Mack et al.
patent: 6023196 (2000-02-01), Ashby et al.
patent: 2002/0067205 (2002-06-01), Aparin et al.
patent: 2004/0043742 (2004-03-01), Beumer

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