Patent ID: 7368990

Claim:
A differential amplifier comprising: first and second input terminals; an output terminal; first and second differential pairs; first and second current sources for supplying currents to said first and second differential pairs, respectively; said first differential pair having first and second inputs constituting an input pair thereof connected to said first input terminal and said output terminal, respectively; said second differential pair having first and second inputs constituting an input pair thereof connected to said second input terminal and said output terminal, respectively; a load circuit connected to output pairs of said first and second differential pairs, for outputting a signal obtained on combining outputs of said first and second differential pairs from at least one of respective connection node between the output pairs of said first and second differential pairs and said load circuit; an amplifier stage for receiving at least one signal at a connection node between said output pairs of said first and second differential pairs and said load circuit and outputting a voltage at said output terminal; and a current control circuit for controlling said first and second current sources to control the ratio of currents supplied to said first and second differential pairs, respectively.