Patent ID: 8773190

Claim:
A method to provide a fine DC compensation, comprising: setting a total gain of a stage associated with a signal path having a plurality of stages, the total gain set to a value that equals a product of a first total gain of at least one preceding stage and a first gain of the stage; setting at least two different DC compensation signals for the stage; measuring a DC residual signal at an output of the signal path for each of the two different DC compensation signals to determine a first linear relationship between the DC compensation signal and the DC offset residual at the output of the signal path; setting the total gain of the stage to a value that equals a product of a second total gain of at least one preceding stage and a second gain of the stage; setting the at least two different DC compensation signals; measuring the DC residual signal at the output of the signal path for each of the two different DC compensation signals to determine a second linear relationship between the DC compensation value and total gain; and determining an interception point of the first linear relationship and the second linear relationship, a value represented at the interception point being the fine DC compensation signal.