Patent ID: 7876147
Filing Date: 2011-01-25
Classification: H03F,H03H

Abstract:
1. A method to compensate for DC offset in a filter, the filter including a plurality of transconductance pieces, the method comprising: measuring a corresponding DC offset associated with each transconductance piece of the plurality of transconductance pieces using an offset measurement module; storing each measured DC offset corresponding to each transconductance piece of the plurality of transconductance pieces using the offset measurement module; based upon a received bandwidth signal, selecting one or more of the plurality of transconductance pieces to be used during operation of the filter; deriving an aggregate amount of DC offset for the one or more selected transconductance pieces, the aggregate amount of DC offset being derived based on each stored DC offset value corresponding to each selected transconductance piece using the offset measurement module; and applying the derived aggregate amount of DC offset to the one or more selected transconductance pieces to compensate for the DC offset during the operation of the filter using the offset cancellation module.