System and method for correcting DC offset

Details System and method for correcting DC offset System and method for correcting DC offset

2006-12-28

2008-10-07

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S117000, C341S119000, C341S120000

Reexamination Certificate

active

07432837

ABSTRACT:
A system for correcting a DC offset includes a digital-to-analog (D/A) converter module (30), a summing circuit (40), an inphase-to-quadrature (I/Q) modulator (50), a spectrum analyzer module (60) and a DC offset correction module (70). The D/A converter module converts digital control signals to analog control signals, and outputs DC offset regulating signals. The summing circuit respectively sums up the DC offset regulating signals and corresponding vectors of a base band signal. The I/Q modulator receives the summed base band signal, and converts the summed base band signal to a radio frequency (RF) signal. The spectrum analyzer module analyzes an energy variation according to a DC offset contained in the RF signal. The DC offset correction module outputs the digital control signals to adjust the DC offset regulating signals, thereby obtaining the lowest energy variation.

REFERENCES:
patent: 6745015 (2004-06-01), Yochem
patent: 6771709 (2004-08-01), Huang et al.
patent: 1531774 (2004-09-01), None

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