Method and system for a second order input intercept point...

Details Method and system for a second order input intercept point... Method and system for a second order input intercept point...

2008-09-02

2008-09-02

Maung, Nay (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

C455S136000, C455S317000, C375S298000

Reexamination Certificate

active

10976977

ABSTRACT:
In RF transceivers, a method and system for a second order input intercept point (IIP2) correction are provided. A DC offset sensor may detect DC offset voltages produced by blocker signals in “I” and “Q” signal component paths in an RF receiver. The DC offset sensor may generate control signals which may be utilized by a first and second injection circuits to generate DC offset currents that compensate for the DC offset voltages in the signal component paths. An injection circuit may utilize current drivers to generate binary weighted currents which may be added together to produce a DC offset current. The polarity of the DC offset current and the selection of which current drivers to use may be determined by the control signals. A calibration voltage may also be utilized to correct or adjust the gain in the injection circuit.

REFERENCES:
patent: 2003/0174783 (2003-09-01), Rahman et al.
patent: 2004/0229580 (2004-11-01), Chen

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