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Programmable Low-Power Low-Noise Capacitance to Voltage Converter for MEMS Accelerometers
Guillermo Royo1, Carlos Sánchez-Azqueta2, Cecilia Gimeno3
1Group of Electronic Design-Aragón Institute of Engineering Research, Universidad de Zaragoza, 50009 Zaragoza, Spain. royo@unizar.es.
Abstract:
In this work, we present a capacitance-to-voltage converter (CVC) for capacitive accelerometers based on microelectromechanical systems (MEMS). Based on a fully-differential transimpedance amplifier (TIA), it features a 34-dB transimpedance gain control and over one decade programmable bandwidth, from 75 kHz to 1.2 MHz. The TIA is aimed for low-cost low-power capacitive sensor applications. It has been designed in a standard 0.18-μm CMOS technology and its power consumption is only 54 μW. At the maximum transimpedance configuration, the TIA shows an equivalent input noise of 42 fA/ Hz at 50 kHz, which corresponds to 100 μg/ Hz .
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