A high performance current-mode instrumentation amplifier for biomedical applications

In this paper, a high performance current-mode instrumentation amplifier has been proposed for low noise, low power, high CMRR and adjustable gain with an external resistor for various biomedical signal processing. Based on post-layout simulation results, the proposed current-mode amplifier achieves an overall gain of 84.2 dB (PMOS type) 92.5dB (BJT type), input-referred noise of 107.7443n V√Hz (PMOS type) 54.9401n V√Hz (BJT type), CMRR of 125.3 dB (PMOS type)121.8dB (BJT type), power consumption of 61.5043 uW (PMOS type)65.6571 uW (BJT type) at a 1.8-V supply using a standard 0.18-um CMOS technology.