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A MOS switched capacitor ladder filter in SIMOX technology for high temperature applications up to 300 deg C
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 3dB-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 voltages of the switched-capacitor filter is 10 V. The temperature range is extended up to 300 deg C. Experimental results of the transistors, the transmission gates, the operational amplifier and the complete filter are presented.