Abstract: A CMOS voltage controlled current source is described for furnishing current to a load in a charging mode and to receive current from a load in a discharging mode of operation. This bi-lateral current source is voltage controlled and provides a current which is proportional to the applied voltage. The current flow into, and out of the current source changes in a linear fashion and varies proportional to the input control voltage. This bi-lateral current source is made from all CMOS devices.

Abstract: A family of differential amplifiers are described which utilize only MOSFET transistors as the active devices. These amplifiers exhibit an infinite input impedance and zero input offset and bias currents. The circuits are capable of operating over a wide range of DC supply voltages at extremely low DC current drain. A differential amplifier is shown which operates from a single positive DC supply voltage and which handles a wide range of input common mode voltage swings including some negative common mode voltages. Another amplifier is shown which operates from a combination of a single positive and a single negative supply voltage and which handles a wide range of positive and negative input common mode voltage swings.