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In this paper, a nanopower CMOS frequency reference designed with a 0.25-mum BiCMOS process for an ultra- low-power capacitive sensor interface is presented. Due to the low supply voltage of 1 V, two parallel frequency references based on source-coupled CMOS multivibrators are used to implement the two required operating modes. In mode 1, when driving a 1(More)
micropower low-dropout regulator with a programmable on-chip load capacitor for a low-power capacitive sensor interface. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the Aalto University School of Science and Technology's products or services. Internal or personal(More)
A continuous time analog interface for a capacitive accelerometer element is implemented. The integrated part of the interface includes an oscillator and readout circuitry excluding a controller and references. For the realized sensor, the minimum equivalent acceleration noise density of 400 ng/radicHz is measured. A full scale acceleration of plusmn1.5 g(More)
Capacitive accelerometers [1] have advantages such as zero static bias current, the capability of high sensitivity, and excellent thermal stability, making their use in low-power applications attractive. In this paper, an interface ASIC designed for a capac-itive 3-axis micro-accelerometer [2] is presented. The die area and power dissipation are reduced by(More)