Mixer offset cancellation without generating I/Q imbalance

Details Mixer offset cancellation without generating I/Q imbalance Mixer offset cancellation without generating I/Q imbalance

2005-06-27

2009-11-10

Vo, Nguyen (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S205000, C455S280000, C455S326000

Reexamination Certificate

active

07616938

ABSTRACT:
An offset cancellation scheme in which offset cancellation current is sourced into one differential branch of a driver circuit and sinked from the opposite differential branch. The source/sink arrangement allows for offset cancellation current to be introduced into the circuit, but the overall total average current remains substantially unchanged. When used in an I and Q mixer circuits, the offsets may be canceled without generating an I/Q imbalance in the I and Q mixers.

REFERENCES:
patent: 6140845 (2000-10-01), Benachour
patent: 7012457 (2006-03-01), Moran et al.
patent: 7085549 (2006-08-01), Peterson et al.
patent: 2003/0157902 (2003-08-01), Khorram
patent: 2003/0157917 (2003-08-01), Khorram
patent: 2005/0141634 (2005-06-01), Lin

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