Amplifier circuit

An amplifier circuit that outputs a pair of differential output signals through a first output terminal and a second output terminal, comprising:

• a first amplifier stage electrically connected to a first node and a second node and configured to amplify a pair of differential input signals;
• a second amplifier stage electrically connected to the first node and the second node and coupled to the first output terminal and the second output terminal;
• a first switch coupled between the first output terminal and a first reference voltage;
• a second switch coupled between the second output terminal and the first reference voltage;
• a third switch coupled between the first node and the first reference voltage;
• a fourth switch coupled between the second node and the first reference voltage;
• and
• a fifth switch coupled between a second reference voltage and the first amplifier stage;
• wherein the second amplifier stage functions as a common-source amplifier.

An amplifier circuit having a first output terminal and a second output terminal, comprising:

• a first transistor having a first terminal, a second terminal, and a first control terminal, the second terminal being coupled to the first output terminal;
• a second transistor having a third terminal, a fourth terminal, and a second control terminal, the fourth terminal being coupled to the second output terminal;
• a third transistor having a fifth terminal, a sixth terminal, and a third control terminal, the sixth terminal being coupled to the first terminal, and the third control terminal receiving a first input signal;
• a fourth transistor having a seventh terminal, an eighth terminal, and a fourth control terminal, the seventh terminal being coupled to the fifth terminal, the eighth terminal being coupled to the third terminal, and the fourth control terminal receiving a second input signal;
• a first switch having a ninth terminal and a tenth terminal, the ninth terminal being coupled to a first reference voltage, and the tenth terminal being coupled to the first output terminal;
• a second switch having an eleventh terminal and a twelfth terminal, the eleventh terminal being coupled to the first reference voltage, and the twelfth terminal being coupled to the second output terminal;
• a third switch having a thirteenth terminal and a fourteenth terminal, the thirteenth terminal being coupled to the first reference voltage, and the fourteenth terminal being coupled to the first terminal and the sixth terminal;
• a fourth switch having a fifteenth terminal and a sixteenth terminal, the fifteenth terminal being coupled to the first reference voltage, and the sixteenth terminal being coupled to the third terminal and the eighth terminal;
• and
• a fifth switch having a seventeenth terminal and an eighteenth terminal, the seventeenth terminal being coupled to a second reference voltage, and the eighteenth terminal being coupled to the fifth terminal and the seventh terminal;
• wherein the first control terminal receives the first input signal, and the second control terminal receives the second input signal.