Patent ID: 7385442
Filing Date: 2008-06-10
Classification: H03F

Abstract:
1. A system for constant bandwidth DC offset correction in an amplifier, said system comprising: a plurality of amplifier stages coupled in series, each of said plurality of amplifier stages having an input and an output; a plurality of DC offset correction feedback loops, each of said plurality of DC offset correction feedback loops comprising a variable gain transconductor coupled to an integration capacitor further coupled to a fixed gain transconductor, wherein each of said plurality of DC offset correction feedback loops are coupled to said input and said output of each of said plurality of amplifier stages; wherein a transconductance of said variable gain transconductor in each of said plurality of DC correction feedback loops is varied in relation to a gain of said plurality of amplifier stages, such that said plurality of DC offset correction feedback loops provide DC offset correction while maintaining a constant bandwidth.