A FDCCII Based High CMRR CMIA Design, Compatible with Both Voltage and Current Input Signals

Abstract

This paper presents a current-mode instrumentation amplifier (CMIA) designed based on a fully differential second-generation current conveyor (FDCCII). The CMIA was designed and laid out using 0.13-μm 1p8M TSMC CMOS Technology with ±1.2 V supply voltage and provided very high common-mode rejection ratio (CMRR). The circuit utilizes a high-impedance differential input for voltage signals, as well as a low-impedance differential input for current signals and therefore, it can be adapted to the both types of input signals. The post-layout performance was simulated using CADENCE and the results demonstrated that the designed CIMA achieves voltage and current CMRR magnitude/3-dB band width of 191 dB/11.1 kHz and 213 dB/11.5 kHz respectively. The FDCCII has an internal resistance of 687.6 kΩ/24.3 Ω at corresponding voltage/current inputs. Also, the total consumed power is 502 μW.