The use of differential voltage measurements is widely used in EIT instruments. Instrumentation amplifiers are always affected by common mode voltages at their input. These voltages may have different origins, being the current sources and multiplexers the ones which contribute the most. However, even considering ideal current sources and multiplexers, some amount of common mode voltage will al...

Abstract Wearabl smart devices have become an important method to monitor people’s health. This research work aims offer a relatively optimum solution amplify the biomedical signal in case of wearable devices. is done by using single-stage amplifier and Operational Transimpedance Amplifier (OTA) stage. The OTA stage uses typical 2-stage topology, with first-stage differential pair, second commo...

Nonideal factors which play a key role in performance and yield in high-precision applications of operational amplifiers are rigorously investigated. Of necessity, the combined effects of both deterministic and statistical parameters must be incorporated. The statistical characteristics of the common-mode rejection ratio and the offset of two-stage CMOS op-amps are investigated. The op-amp erro...

A biopotential acquisition analog front-end (AFE) integrated circuit (IC) is presented. The biopotential AFE includes a capacitively coupled chopper instrumentation amplifier (CCIA) to achieve low input referred noise (IRN) and to block unwanted DC potential signals. A DC servo loop (DSL) is designed to minimize the offset voltage in the chopper amplifier and low frequency respiration artifacts...

A new design of current mode instrumentation amplifier (CMIA) with tunable gain and low voltage operation capability is proposed in this paper, which suitable for biomedical signals processing, especially electrocardiogram (ECG). It consists a differencing transconductance (CDTA) dual z copy CDTA (DZC-CDTA). The the CMIA controlled by MOS-based resistor. main advantage its high that can be tune...

This paper presents the designing of a fully differential folded cascode operational transconductance amplifier (OTA) with common mode feedback circuit (CMFB). The designed OTA is operated in sub-threshold region to reduce the power consumption. The simulation is carried out in CADENCE environment using 150nm CMOS. The simulation result shows the DC gain of 82 dB with UGBW of 768 KHz, CMRR of 1...

We present the design and test of a portable multichannel neural data acquisition system. Each analog channel features a low noise (10nV/√Hz), high CMRR (83.4dB) input stage, a 4 order bandpass filter and a selectable gain (60.8dB – 100.8dB). An automatic DC restoration circuit in the input stage rejects the electrodes DC voltage mismatch. The multichannel analog signals are sampled, digitized ...

1.1 A 160μA Biopotential Acquisition ASIC with Fully Integrated IA and Motion-Artifact Suppression .. 2 1.2 On-Chip Gain Reconfigurable 1.2V 24μW Chopping Instrumentation Amplifier with Automatic Resistor Matching in 0.13μm CMOS ...................................................................................................... 5 1.3 A Capacitively Coupled Chopper Instrumentation Amplifier wi...