0.5 V bulk ‐ driven CMOS fully differential current feedback operational amplifier

Abstract

This study presents a new low-voltage fully differential current feedback operational amplifier for ultra-low-voltage and low-power analogue circuit applications. A bulk-driven technique is used to reduce the supply voltage requirement and also provides a rail-to-rail input voltage common-mode swing. The proposed circuit has been simulated using a TSMC 0.18 µm nwell CMOS technology with a 0.5 V supply voltage. Simulation results show that the static power consumption of the proposed circuit is 4.7 µW. The proposed circuit has been used to realise fully differential integrators and fully low-pass/band-pass second-order filters to express the performance of the new circuit.

A 0.3 V Rail-to-Rail Ultra-Low-Power OTA with Improved Bandwidth and Slew Rate

“…Over the years, the research community has increasingly focused on reducing the supply voltage and power consumption at the expense of common-mode rejection ratio (CMRR) performance [11][12][13][14]. Several common-mode feedback (CMFB) approaches, which exploit triode-biased devices or current cancellation, have been proposed with the aim of minimizing the common-mode gain in fully differential OTAs, thus improving their CMRR performance [15][16][17][18][19].…”

Low Power-High Gain Bulk-Driven 3 Stages CMOS Miller OTA in 130nm Technology

“…Employing low Vt transistors is another way to mitigate the power consumption; however, one should consider the noise problem and the increased cost bringing with the low Vt technology. Besides, the bulk-driven transistor approach is a quite efficient way to surpass the effect of threshold voltage, where the bulk terminal is used as the input of the circuit [16][17][18][19][20][21][22][23]. This modification enhances the low voltage operation capability of transistors and allows to low power high performing analog circuits.…”