Method and system for a transmitter loft cancellation scheme...

Telecommunications – Transmitter – Noise or interference elimination

Reexamination Certificate

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Details

C455S284000, C455S285000, C455S264000, C455S293000, C455S315000

Reexamination Certificate

active

07734259

ABSTRACT:
Methods and systems for a transmitter LOFT cancellation scheme that maintains IQ balance are disclosed. Aspects of one method may include providing current compensation to both differential inputs of a mixer for each of I and Q channels. An initial current compensation of X units may be provided, followed by subsequent compensation as needed. The initial compensation may be provided to each differential input of the mixers used for I and Q channels. The subsequent current compensation for the I channel may be independent of the subsequent current compensation for the Q channel. Subsequent current compensation to a first differential input for a mixer may be increased by Y units while decreasing current compensation to the second differential input of the mixer by Y units. In this manner, the DC common mode level for the mixer may remain the same at the initial DC compensation current of X units for both mixers.

REFERENCES:
patent: 6393260 (2002-05-01), Murtojarvi et al.
patent: 7561862 (2009-07-01), Woo-nyun
patent: 2006/0094395 (2006-05-01), Lee et al.

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