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This paper presents the measurement results of a micropower switched-capacitor front end that was designed for three-axis capacitive microaccelerometers. The designed front end can reduce the distorting effects of the electrostatic forces and can be used in single-ended and differential modes. The front end was realized with a 0.13-mum bipolar complimentary metal-oxide-semiconductor process. The silicon...
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 pF capacitive load at 24.6 kHz, the frequency...
In this paper, measurement results for a micropower 2 MHz CMOS frequency reference circuit fabricated with a 0.13 mum CMOS process are presented. This frequency reference circuit, based on source-coupled CMOS multivibrator, provides the clock signal for a read-out circuit of a capacitive sensor. In addition to low power consumption, good frequency stability is required. Supply independent biasing...
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