Amplifier circuit

An amplifier circuit comprising:

• a main amplifier;
• an auxiliary circuit configured to improve a slew rate of the main amplifier;
• and
• a controller for outputting a cut signal instructing the auxiliary circuit to interrupt the auxiliary bias current,
• wherein
• the main amplifier and the auxiliary circuit are connected in parallel between input terminals and output terminals,
• the main amplifier includes a one-stage CMOS amplifier configured to (i) amplify an input voltage difference between two input signals input from the input terminals, and (ii) output, from the output terminals, output signals corresponding to the input voltage difference,
• the auxiliary circuit is configured to (i) generate an auxiliary bias current according to the input voltage difference, and (ii) interrupt, upon receiving an interrupt signal, the auxiliary bias current at a predetermined timing before completion of settling,
• the auxiliary circuit (i) includes an amplifier circuit, and (ii) is configured to interrupt the auxiliary bias current when the cut signal is received from the controller,
• the cut signal is at least part of the interrupt signal,
• the output terminals include a positive output terminal and a negative output terminal,
• the auxiliary circuit includes
• a first P-type MOSFET connected to the negative output terminal and controlling the auxiliary bias current flowing through the negative output terminal,
• a first N-type MOSFET connected to the negative output terminal and controlling the auxiliary bias current flowing through the negative output terminal,
• a second P-type MOSFET connected to the positive output terminal and controlling the auxiliary bias current flowing through the positive output terminal, and
• a second N-type MOSFET connected to the positive output terminal and controlling the auxiliary bias current flowing through the positive output terminal, and
• when the cut signal is input from the controller to the auxiliary circuit, the amplifier circuit is configured to turn OFF the first P-type MOSFET, the first N-type MOSFET, the second P-type MOSFET, and the second N-type MOSFET.