A power-efficient improved recycling folded cascode amplifier

An improved recycling folded cascode amplifier for wide-bandwidth ΣΔ modulator is presented in this article. The proposed amplifier introduces internal positive-feedback pairs to achieve a significant boost in transconductance and DC gain without increasing power or area budget. The proposed recycling folded cascode amplifier was implemented in SMIC standard 65 nm CMOS process. Compared to other recycling folded cascode structures, simulation results show that the proposed amplifier achieves the enhancement of gain-bandwidth and DC gain with the best figure-of-merits.