The described high-bandwidth amplifier achieves high gain and stable high-frequency operation across a wide temperature range for CMOS switched-capacitor filters.
Facilitates robust filters for extreme environments; leaves open clinical translation pending system integration.
The authors describe a high-bandwidth amplifier that simultaneously achieves high gain by using internal positive feedback. The results obtained when the amplifier is used in a general-purpose switched-capacitor biquadratic building block are also presented. This device achieves 150-kHz center-frequency operation with Q accuracy of 15% when clocked at 7.5 MHz with 10-V +or-10% supplies from -55 degrees C to +125 degrees C. With a minimum power supply of 4.5 V, this filter operates with center frequencies up to 100 kHz when clocked at 5 MHz, while performing with the same accuracy and across the same temperature range as above.>
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Laber et al. (1988) studied this question.
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