Voltage to Current Converter explained with PMOS and NMOS transistors

A high-side Voltage to Current V-I converter circuit also known as Voltage-controlled current source is discussed in this video. How the voltage to current conversion works and how to choose circuit components values are explained to realize the target maximum output current and VTC which is DC transconductance coefficient for the conversion in this circuit. We also desire to maximize the conversion efficiency to more than 99% while maximizing output voltage compliance. This circuit is implemented with two operational amplifiers, one low-power N-channel MOSFET transistor and one high-power P-channel MOSFET transistor. The conversion of input voltage to output current is controlled by three resistors in this circuit. The output resistor is a low-impedance high power resistor with a value of of on the order of one ohm. The resistor tolerances are also discussed due to practical considerations. The stability or compensation feedback capacitor and resistors are also discussed for the op amps, NMOS and PMOS transistors.