Patent ID: 7554389

Claim:
A differential amplifier comprising: an input differential stage including first and second differential pairs and a load circuit commonly connected to output pairs of said first and second differential pairs; an amplifier stage that receives a common output signal from said first and second differential pairs and that charge/discharge-drives an output terminal; and first and second capacitors respectively connected to first and second inputs of an input pair of said first differential pair; wherein said first and second inputs of the input pair of said first differential pair receives first and second signals; said first input of the input pair of said second differential pair receives a third signal; and said second input of the input pair of said second differential pair connects to said output terminal and receives sequentially a feedback signal from the output terminal, said differential amplifier further comprising first to third terminals that respectively receive said first to third signals; and first and second switches on/off controlled by a control signal, which are respectively provided between each connection point of said first and second inputs of the input pair of said first differential pair and said first and second capacitors and said first and second terminals that receive said first and second signals; said third terminal being connected to said first input of the input pair of said second differential pair.