Integrated circuit comparator or amplifier

An integrated circuit comparator, comprising:

• a differential amplifier;
• a first power supply line coupled to the differential amplifier, the first power supply line adapted to receive a positive power supply potential of approximately 0.9 volts;
• a source follower circuit coupled to a gate terminal of a first transistor in the differential amplifier;
• and
• an output circuit coupled to the differential amplifier,
• the source follower circuit and the differential amplifier coupled to receive a first input signal.

A differential amplifier, comprising:

• first and second transistors coupled in electrical series between a first node and a second node;
• third and fourth transistors coupled in electrical series between the first node and the second node;
• and
• a source follower circuit coupled to a gate terminal of the first transistor,
• the second transistor and the source follower adapted to receive a first input signal, and the fourth transistor adapted to receive a second input signal.

A differential amplifier, comprising:

• first and second transistors coupled in electrical series between a first node and a second node;
• third and fourth transistors coupled in electrical series between the first node and the second node;
• a source follower circuit coupled to a gate terminal of the first transistor,
• the second transistor adapted to receive a first input signal, and the fourth transistor adapted to receive a second input signal;
• wherein the source follower circuit comprises:
• a first transistor coupled to receive the first input signal;
• and
• a second transistor coupled to a power supply node.