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A micropower low-dropout regulator with a programmable on-chip load capacitor for a low-power capacitive sensor interface

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4 Author(s)
Matti Paavola ; SMARAD-2/Electronic Circuit Design Laboratory, Helsinki University of Technology, Espoo, Finland ; Mika Kamarainen ; Mikko Saukoski ; Kari Halonen

In this paper, a micropower low-dropout regulator (LDO) for a low-power capacitive sensor interface fabricated in a 0.25 mum BiCMOS process is presented. The LDO with on-chip voltage and current references, and an on-chip programmable load capacitor, occupies an active silicon area of 0.18 mm2. It is stable with zero load current over the load capacitance range from 0 to 1 nF. The input voltage range extends from 1.2 to 2.75 V, while the designed output voltage is 1.0 V. The measured quiescent current of the LDO including the on-chip references is 7.6 muA. According to the measurements, the regulated output has a temperature coefficient (TC) of 57.2 ppm/degC, a line regulation of 2.71 mV/V, and a load regulation of 1.64 mV/mA. The rms output noise integrated over the bandwidth ranging from 1 Hz to 100 kHz is 1.365 mV.

Published in:

Electronics, Circuits and Systems, 2008. ICECS 2008. 15th IEEE International Conference on

Date of Conference:

Aug. 31 2008-Sept. 3 2008