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A MOS switched-capacitor ladder filter in SIMOX technology for high temperature applications up to 300°C

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3 Author(s)
M. Verbeck ; Fraunhofer-Inst. fur Mikroelectron. Circuit & Syst., Duisburg, Germany ; C. Zimmermann ; H. L. Fiedler

This paper describes techniques and methods used to realize a seventh order switched-capacitor low pass filter in SIMOX technology. The filter has Bessel characteristic and a 3 dB-bandwidth of 20 Hz at a clock frequency of 100 kHz. Special design of transistors and transmission gates results in drastically reduced leakage currents at high temperatures. The power supply voltage of the switched-capacitor filter is 10 V. The temperature range is extended up to 300°C. Experimental results of the transistors, the transmission gates, the operational amplifier, and the complete filter are presented

Published in:

IEEE Journal of Solid-State Circuits  (Volume:31 ,  Issue: 7 )