Carrier leak reduction transmitter circuit

Details Carrier leak reduction transmitter circuit Carrier leak reduction transmitter circuit

2006-01-19

2009-10-20

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S295000, C455S324000, C455S333000, C455S127100, C327S291000, C332S106000, C341S020000, C341S173000

Reexamination Certificate

active

07606323

ABSTRACT:
A transmitter circuit has two mixers that modulate a carrier wave according to an input signal, outputs a signal having information in a phase and an amplitude, detects a DC offset in each of the mixers, and adds a DC voltage that corrects the detected DC offset to the input signal of the mixers. The mixer is a double balanced mixer having two load resistors, and the transmitter circuit has a resistor that is connected between a node of two load resistors and a power supply, a limiter amplifier that amplifies a signal, and a control unit that changes first and second potentials using a signal that is outputted by the limiter amplifier. The first and second potentials become a potential of the DC voltage that corrects the DC offset.

REFERENCES:
patent: 6122497 (2000-09-01), Gilbert
patent: 7356326 (2008-04-01), Kim
patent: 2003/0095607 (2003-05-01), Huang et al.
patent: 2005/0141634 (2005-06-01), Lin
patent: 2001-223535 (2001-08-01), None
B. Razavi, “RF Transmitter Architectures and Circuits,” IEEE 1999 Custom Integrated Circuits Conference, 1999, pp. 197-204.

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