Wide output swing inverter fed modified regulated cascode amplifier for analog and mixed-signal applications

Two modified regulated cascode amplifier (RCA) structures are presented that reduce the output compliance voltage requirements of conventional RCA. One structure utilizes a push-pull amplifier to enhance output resistance whereas the other structure incorporates a level shifter in the conventional RCA structure. P-SPICE simulations have been used to validate the proposed structures at ±0.6 V for 250 nm CMOS technology. The modified (utilizing level shifter) and the conventional RCA structure have similar properties (18 M¿ output impedance, 74 dB dc gain, 1.1 GHz unity gain bandwidth and 35 ¿W dissipation), whereas significant improvement have been observed for push-pull inverter fed RCA structure.