Mikko Saukoski

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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)
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)
In this paper, we describe the design of a 2 MHz CMOS frequency reference circuit based on a relaxation oscillator. The circuit provides the clock signal for a read-out circuit of a capacitive sensor. The frequency reference circuit is always active, thus low power consumption is an essential requirement. Supply independent biasing was used to allow supply(More)