Recycle folded cascode OTA with current control circuit / Nordiana Mukahar and Siti Aishah Che Kar

This paper presents an improved architecture of recycle folded cascade (RFC) OTA with current control
circuit that achieves improved DC gain and settling time without sacrificing power and area. This is achieved by
exploiting and using idle device in the signal path and separates the AC and DC path, which results in an enhanced
transconductance, output resistance, gain, settling time and power dissipation. A recycle folded cascade amplifier
architecture was implemented in 90 nm CMOS process with 1 V power supply. Simulation results shows that the
proposed structure significantly increase the DC gain bandwidth compared to the recycle folded cascade OTA and
consume very low power dissipation. Theoretical analysis and LTSpice simulations prove the performance of the
new OTA.