Design of a minimum power , low - voltage supply fully

{ Two designs of a fully diierential transconductance ampliier to be used in a rst stage of a pipelined 13-Bit A/D converter are developed and presented. A three stage ampliier achieves the lowest power design. The dynamic range speciication is met according to the expression for noise power indicated in the design speciication sheet. In this report, anyway, we show that such expression is incorrect for a Miller compensated topology. A second design is developed to meet the speciications according to a more accurate expression of the noise power. Much higher power consumption is obtained even from an optimized design. Miller compensation techniques are inferred to be inadequate to address low-noise low-power speciications.