Ultra-low-power bulk-driven fully differential subthreshold OTAs with partial positive feedback for G m-C filters

摘要

AbstractThis paper presents an ultra-low-power, bulk-driven, source-degenerated fully differential transconductor (FD-OTA), operating in subthreshold region. The source-degeneration (SD) and bulk-drive ensure linearity and rail-to-rail input swing. The flipped voltage follower and SD resistor perform V–I conversion in input core with power efficient class AB mode of operation. The reduction in open loop gain and gain bandwidth (GBW) of bulk-drive is compensated by applying partial positive feedback at diode connected MOSFET pair. The current gain from input core to output load side is set (1:1) in OTA1and (1:4) in OTA2. The OTA2offers increased transconductance and GBW whereas self-cascode load increases the output impedance and overall gain of the FD-OTAs. Both the input core and common source self-cascode load operate in class AB mode so these FD-OTAs provide enhanced slew rates. These OTAs have been employed to implement Biquadratic low-frequency Gm-C filter suitable for bio-signal applications. The proposed OTA2has used dual supply voltage of ±?0.3?V and dissipates around 70?nW power and provides 62?dB FD-open loop gain with GBW of 7.73?kHz while driving the FD-load of 2?×?15?pF. The Cadence VIRTUOSO environment using UMC 0.18?μm CMOS process technology has been used to simulate the proposed circuit. The Simulation results verified fully differential total harmonic distortion of ??72?dB, for 1.2?Vp–psignal at 200?Hz frequency in unity gain configuration with resistive degeneration of 1?M? for OTA1.]]>