Tayebeh Asiyabi, Dr. Jafar Hosseinipouya,
Volume 22, Issue 1 (4-2025)
Abstract
Abstract: Process parameters in industry or power plant must be continuously monitored and controlled. Temperature is one of the most important parameters that must be controlled by the RTD, which is used to adjust the signal amplitude from the amplifier at the output of the Wheatstone bridge. In this paper, a new design for three-stage CMOS operational transconductance amplifier is proposed. The proposed structure eliminates the forward path and strengthens the feedback path in the compensation network at the same time. Also, the presented circuit uses only a small compensation capacitor. The simulation of the proposed circuit has been done using 0.18 μm CMOS technology in the HSPICE simulator and it has been validated by theoretical analysis, and the simulation results confirm the correctness of the theoretical analysis. The frequency response of the proposed amplifier shows that the DC gain of the circuit is on the order of 120 dB and the bandwidth of the circuit is 18.8 MHz with a phase margin of 88°. The power dissipation of the proposed circuit is fairly very small and is about 544 μW in 1.8 V power supply, which shows that the proposed circuit has high efficiency and efficiency coefficients.
