Patent ID: 7671674
Filing Date: 2010-03-02
Classification: H03F

Abstract:
1. An amplifier circuit comprising: a complementary amplifier stage with first and second amplifier means in a bridge configuration, said first and second amplifier means comprising a first group of input terminals and a second group of input terminals; and current generator means for generating a compensation offset current and for injecting said compensation offset current to a junction node between said first group of input terminals of said first and second amplifier means, said current generator means being coupled to said second group of input terminals such that input signals that are supplied to said second group of input terminals of said first and second amplifier means are received by said current generator means; wherein said current generator means is configured to generate said compensation offset current using the values of the input signals that are supplied to said second group of input terminals of said first and second amplifier means, to balance the outputs of said first and second amplifier means into equal amplitude but opposite polarity.