Apparatus and method for reducing flicker noise of CMOS amplifier

An amplifier comprising:

• a load circuit connected to a first power source;
• a signal input circuit connected to the load circuit and receiving two input signals;
• and
• a switch-bias circuit connected between a second power source and the signal input circuit,
• wherein:
• the signal input circuit includes two pairs of Metal-Oxide Semiconductor Field Effect Transistors (MOSFETs) which simultaneously receive the two input signals and are respectively connected to two contact points connected to the load circuit,
• the switch-bias circuit includes a first MOSFET connected to one pair of MOSFETs of the two pairs of MOSFETs which functions as a current source when a first clock signal is activated, and a second MOSFET connected to another pair of MOSFETs of the two pairs of MOSFETs and which functions as a current source when a second clock signal is activated, and
• wherein the amplifier amplifies the two input signals and outputs the amplified input signals via the two contact points.