Qualitative analysis of mos based darlington pair amplifiers

Two modifications in small-signal Darlington pair amplifier are proposed initially by replacing BJTs of the pair with two identical power MOS transistor. As a rare feature, one of the proposed amplifiers simultaneously produces high voltage and current gains with widening of bandwidth and therefore it can be used for signal processing if used with appropriate filter. Poor response of BJT based conventional small-signal Darlington pair amplifiers at higher frequencies are found absent in the proposed amplifier circuits. Variations in voltage gain as a function of frequency and different biasing reSistances, bandwidth and total harmonic distortion of the amplifiers are also perused.