Patent ID: 7098736

Claim:
An amplifier circuit having a differential amplifier which amplifies a difference signal between an inverted signal and a non-inverted signal comprising: a first transconductance amplifier which inputs an output of the differential amplifier and a first bias voltage therein, converts a difference signal between the output of the differential amplifier and the first bias voltage into a current signal and outputs the current signal; a second transconductance amplifier which has an output thereof connected to the output of the first transconductance amplifier, inputs a voltage generated by both outputs and a second bias voltage therein, converts a difference signal between the voltage generated by both outputs and the second bias voltage into a current signal, and outputs the current signal; a first output transistor which has a gate thereof connected to the output of the second transconductance amplifier and a source thereof connected to a first power source; a second output transistor which has polarity opposite to polarity of the first output transistor, has a gate thereof connected to the output of the differential amplifier, has a source thereof connected to a second power source, and has a drain thereof connected to a drain of the first output transistor thus constituting a push-pull output; and a phase compensation element which is connected between the output of the differential amplifier and a node between the drains of the first and the second output transistors.