Learn More
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)
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)