Abstract
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 element matching (DEM) technique. This work was fabricated in a 0.35-µm CMOS TSMC process. After chopping the Gm 1 -Gm fb and Gm 2 stages of CR-CFIA with 10kHz frequency, the input-referred noise power spectral density (PSD) was under 100nV/√Hz higher than 10kHz. The PSD effectively decreases below 100Hz. The gain of this system was 13. Total current supply was only 66.6µA. Total power consumption for analog block was 199.8µW under a 3-V supply and the core chip size was 0.81mm2 (total area 3.01mm2).
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