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A VCO-based sensor readout circuit is presented. It comprises a VCO-based integrator with counters, and a capactively-coupled feedback DAC, to form a 1st-order DSM with high input impedance and wide dynamic range for voltage sensors. Chopping is applied to suppress the flicker noise. The time-domain approach relaxes the voltage swing requirement compared to that of a Gm-C integrator, and thus area...
This paper presents a high-precision low-noise amplifier intended to be used in the front-end of an analog signal processing channel in sensor applications. A current feedback instrumentation amplifier (CFIA) with current-reuse (CR) topology employed chopping techniques to eliminate flicker (1/f) noise and offset due to amplifier, and the gain mismatch issue due to CR topology was solved by dynamic...
Area-efficient low-noise instrumentation amplifiers (IAs) are required in various multi-channel sensing and monitoring applications. These IAs must be designed to achieve low noise and low power, good noise efficiency factor (NEF), good gain matching and low crosstalk among multiple channels [1]. For a continuous sensor array application, each sensor unit is conventionally connected to an individual...
A chopped capacitively-coupled instrumentation amplifier (CCIA) with a proposed duty-cycled Gm-C DC servo loop (DSL) for bio-potential signal acquisition is presented. The proposed architecture realizes a large time constant with small circuit area without sacrificing noise and power performance. Furthermore, this pseudo-resistor-less design grants this architecture easily portable for more advanced...
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