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SUMMARYA continuous-time accelerometer interface is feasible when high dynamic range together with wide signal band is required. In this paper, design of interface electronics for a capacitive sensor is presented. The interface design is focused on attaining resolutions up to 120 dB together with a signal bandwidth of 300 Hz. The essential circuit structures of the interface will be presented and analyzed in detail. Important sources of instabilities and issues that affect the dynamic properties of the sensor are discussed. Measured and simulated results of the closed-loop sensor will be provided to support the theory.

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The linear model and the design of an analog drive loop for the drive (primary) resonator in a capacitive gyroscope are presented. Four different types of gain control topologies are compared and analyzed with both P-and PI-type controllers. The simple model proposed in the paper allows the small signal properties of the loop to be predicted. The theoretical models based on the small signal analysis are compared to the simulated and measured results. A proportional amplitude controller, together with the rest of the drive loop, is implemented using a highvoltage 0.35-lm CMOS technology and a nominal supply of 3 V. Clock generation using a PLL and the drive loop signal as the reference are also discussed in the paper.