Journal ArticleDOI
A generic interface chip for capacitive sensors in low-power multi-parameter microsystems
TLDR
In this article, a low-power sensor interface chip compatible with smart microsystems and a wide range of capacitive transducers is presented, which can communicate with an external microcontroller using a nine-line sensor bus standard, contains a switched-capacitor readout circuit, and includes a temperature sensor.Abstract:
This paper presents a generic low-power sensor interface chip compatible with smart microsystems and a wide range of capacitive transducers. The interface chip is highly programmable, can communicate with an external microcontroller using a nine-line sensor bus standard, contains a switched-capacitor readout circuit, supports sensor self-test, and includes a temperature sensor. The circuit can interface with up to six external sensors and contains three internal programmable reference capacitors in the range of 0.15–8 pF. The chip measures 3.2×3.2 mm in a standard 3-μm single-metal double-poly p-well process, dissipates less than 2.2 mW from a single 5 V supply, and can resolve input capacitance variations of less than 1 fF in 10 Hz bandwidth.read more
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References
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Thermal sensors based on transistors
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Journal ArticleDOI
A low-voltage CMOS bandgap reference
Eric A. Vittoz,Olivier Neyroud +1 more
TL;DR: In this article, a voltage source that is proportional to absolute temperature (PTAT) was proposed. But the voltage source was not designed to operate down to 1.3 V with a current drain below 1 /spl mu/A.
Journal ArticleDOI
A generic multielement microsystem for portable wireless applications
TL;DR: System features such as active power management, the intramodule sensor bus, generic bus interface circuitry, and in-module sensor compensation based on bivariate polynomials are discussed.
Proceedings Article
A Low-Voltage CMOS Bandgap Reference
Eric A. Vittoz,Olivier Neyroud +1 more
TL;DR: The well-controlled exponential ID(VS) characteristics of MOS transistors operating in weak inversion allow the realization of a very good bandgap reference compatible with CMOS technologies and operating with an input voltage as low as 1.3 V as mentioned in this paper.
Journal ArticleDOI
High-accuracy circuits for on-chip capacitance ratio testing or sensor readout
Yuming Cao,Gabor C. Temes +1 more
TL;DR: In this article, novel CMOS circuits are described for the on-chip measurement of capacitor ratios, which can provide a high-accuracy A/D interface for capacitive sensors, or allow the precise calibration of switched-capacitor DACs, amplifiers and other circuits utilizing ratioed capacitors.