The implementation of a fully-differential (FD) instrumentation amplifier (IA), based on indirect current feedback (ICF) and aimed to electrical impedance measurements in an Internet Things (IoT) biomedical scenario, is presented. IA consists two FD transconductors, process the input signal feed back output signal, summing stage, used add both contributions generate correcting common-mode netwo...

This paper presents a configurable analog front-end (AFE) for low-power neural recording systems that is capable of the current-to-voltage converter, programmable gain, ultra-high input impedance, low-noise, and wide bandwidth. A 6-channel AFE consisting 6 1-channel AFEs also introduced in this paper. The proposed designed on 180nm CMOS process low noise operates over frequency range 0.5 Hz to ...

A new patented balanced input circuit emulates the extremely high common-mode input impedances which give a quality audio transformer its hum and buzz rejecting advantage in real-world audio systems, where driving source impedances are rarely perfectly balanced. Compared to traditional "active balanced" circuits, the new circuit can produce CMRR improvements up to 80 dB but is only slightly mor...

Abstract This paper presents a comparative EMI susceptibility study of different integrated operational transconductance amplifier (OTA) topologies. We analyzed conventional well-known topologies based on the Miller OTA and folded cascode concepts with lower power consumption. The output dc voltage shifts induced by supply input common mode high frequency disturbances are presented. On top comp...

A new CMOS fully differential bandpass amplifier (BPA) based on the structure of a transresistance (Rm) amplifier and capacitor is proposed and analysed. In this design, the Rm amplifier is realised by a simple inverter with tunable shunt-shunt feedback MOS resistor and tunable negative resistance realised by crosscoupled MOS transistors in parallel with a current source. The capacitor is in se...

Limited Common-Mode Rejection Ratio (CMRR) in balanced interfaces often limits dynamic range in real-world audio systems. Conventional differential amplifier input circuits suffer serious CMRR degradation when driven by real system signal sources instead of laboratory generators. An ideal audio transformer, because of its extremely high common-mode impedances, is virtually immune to this degrad...

In recent years, Electrical Bioimpedance (EBI) methods have gained importance. These methods are often based on obtaining impedance spectrum in the range of β-dispersion, i.e. from a few kHz up to some MHz. To measure EBI a constant current is often injected and the voltage across the tissue under study is recorded. Due to the performance of the current source influences the performance of the ...