Patent ID: 7688140
Filing Date: 2010-03-30
Classification: H03F

Abstract:
1. A differential amplifier circuit comprising: an input stage comprising: an output stage comprising: a first current combining circuit generating a current based upon a current that flows through a second output of the first differential pair; and a second current combining circuit generating a current based upon a current that flows through a second output of the second differential pair, wherein a first current having a value resulting from adding a current of the first output of the second differential pair and a current generated by the first current combining circuit flows in the load element connected to the first output of the second differential pair, wherein a second current having a value resulting from adding a current of the first output of the first differential pair and a current generated by the second current combining circuit flows in the load element connected to the first output of the first differential pair, and wherein the values of the first and second currents does not reach a value of approximately zero.