Current feedback output circuit

摘要

The current feedback output circuit includes first and second transistors. The current feedback output circuit includes a current amplifier that has a non-inverting input terminal, an inverting input terminal, a first output terminal and a second output terminal, an input impedance of the non-inverting input terminal being higher than an input impedance of the inverting input terminal, and flows a current obtained by amplifying the difference between a current of an input signal to the non-inverting input terminal and a current input to the inverting input terminal between the first output terminal and the second output terminal. The current feedback output circuit includes first to sixth current mirror circuits. The current feedback output circuit includes a current feedback circuit that supplies a current responsive to a voltage at the signal output terminal to the inverting input terminal.

主权项

1. A current feedback output circuit, comprising:
a signal output terminal at which an output signal is output; a first transistor of a first conductivity type that is connected between the signal output terminal and a first power supply rail, a first voltage being applied to the first power supply rail; a second transistor of a second conductivity type, which is different from the first conductivity type, that is connected between the signal output terminal and a second power supply rail, a second voltage, which is lower than the first voltage, being applied to the second power supply rail; a current amplifier that has a non-inverting input terminal, an inverting input terminal, a first output terminal and a second output terminal, an input impedance of the non-inverting input terminal being higher than an input impedance of the inverting input terminal, and flows a current obtained by amplifying the difference between a current of an input signal to the non-inverting input terminal and a current input to the inverting input terminal between the first output terminal and the second output terminal; a first current mirror circuit that flows a first mirror current, which is a mirror current of a current flowing between the first power supply rail and the first output terminal, between the first power supply rail and a first node; a second current mirror circuit that flows a second mirror current, which is a mirror current of a current flowing between the second power supply rail and the second output terminal, between the second power supply rail and a second node; a third current mirror circuit that flows a third mirror current, which is a mirror current of a current flowing between the first power supply rail and a third node, between the first power supply rail and a fourth node, which is connected to a control terminal of the first transistor; a fourth current mirror circuit that flows a fourth mirror current, which is a mirror current of a current flowing between the second power supply rail and a fifth node, between the first power supply rail and a sixth node, which is connected to a control terminal of the second transistor; a fifth current mirror circuit that flows a fifth mirror current, which is a mirror current of a current flowing between the third node and the second node, between the fourth node and the sixth node; a sixth current mirror circuit that flows a sixth mirror current, which is a mirror current of a current flowing between the fifth node and the first node, between the sixth node and the fourth node; and a current feedback circuit that supplies a current responsive to a voltage at the signal output terminal to the inverting input terminal.