Novel low-voltage folder for analogue-to-digital converter

A novel architecture of low-voltage folder is presented for folding analogue-to-digital (A/D) converter applications. With MOS transistors completely replacing the resistor load used in the conventional folder, this circuit has a good power-supply–rejection-ratio (PSRR) 21.2?dB for the output common voltage and can work well even under a very low power supply 1.0?V. A moderately high gain 14.5?dB and a wide input bandwidth 506?MHz are obtained. The circuit dissipates only 1.2?mW from 1.2?V power supply. The performance is verified by Hspice-Avanti-99.4 simulations on 0.18?µm digital CMOS technology.