A configuration of operational transconductance amplifier (OTA) based on floating-gate MOSFETs for lowpower, low-voltage, and low-frequency applications is presented in this paper. The main features of the proposed OTA are design simplicity and rail to rail input voltage at supply voltage of ±0.5 V. The proposed OTA has high output impedance, good stability, and reduced power consumption of 36 μW. PSpice simulation results using 0.18 μm CMOS technology are presented to prove the results achieved, and in the light of them, the major characteristics of the circuit are manifested.
A new ultra-low-voltage (LV) low-power (LP) bulk-driven quasi-floating-gate (BD-QFG) operational transconductance amplifier (OTA) is presented in this paper. The proposed circuit is designed using 0.18 μm CMOS technology. A supply voltage of ±0.3 V and a quiescent bias current of 5 μA are used. The PSpice simulation result shows that the power consumption of the proposed BD-QFG OTA is 13.4 μW. Thus, the circuit is suitable for low-power applications. In order to confirm that the proposed BD-QFG OTA can be used in analog signal processing, a BD-QFG OTA-based diodeless precision rectifier is designed as an example application. This rectifier employs only two BD-QFG OTAs and consumes only 26.8 μW.
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