Abstract
This paper describes design considerations for a CMOS amplifier to meet a frequency specification at the minimum current-consumption. Minimum bias current and optimum transistor sizes of a basic differential amplifier can be determined using parameters of output parasitic capacitances and load capacitances if the input transistors operate in strong inversion region. It can be approximately estimated in cases of weak inversion and moderate inversion operations. Class-AB differential amplifiers are also examined and a potential current reduction of them is indicated.
