Patent ID: 6542033
Filing Date: 2003-04-01
Classification: H03F

Abstract:
A differential amplifier circuit comprising:an input circuit for generating a difference voltage signal between a positive input signal and a negative input signal: a feedback bias circuit for producing a bias voltage in response to the difference voltage signal, and for performing a feedback control on the bias voltage by feeding back an output current; an output circuit, comprising a first output transistor (MP17) and a second output transistor (MN11) that are commonly connected to an output terminal, for producing the output current in response to the bias voltage and for outputting it to the output terminal; and a current detection circuit comprising a first current detection transistor (MP16), which is connected to the first output transistor commonly at a gate thereof to detect its current, and a second current detection transistor (MN10) which is connected to the second output transistor commonly at a gate thereof to detect its current, wherein the feedback bias circuit performs the feedback control by outputting smaller one of detection currents of the first current detection transistor and the second current detection transistor.