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Drift Elimination Circuit for Differential Amplifiers

IP.com Disclosure Number: IPCOM000090997D
Original Publication Date: 1969-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Walton, CA: AUTHOR

Abstract

This circuit corrects for low-frequency, including zero DC frequency, errors due to drift and imperfect internal amplification. Differential amplifier 10 amplifies a voltage wave appearing at input terminals 12 and 14 and delivers an output at terminals 16 and 18. The latter can be at ground potential as shown. Stabilizing amplifier 20 has input terminals connected to input terminals 12 and 14. The latter can be at floating ground potential at point 22 as shown. Amplifier 20 continuously monitors the total error, modifies it, and delivers it to capacitor 30. The voltage across capacitor 30 is the correction voltage for amplifier 10. Amplifier 20 is a floating chopper, stabilized narrow-band amplifier.

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Drift Elimination Circuit for Differential Amplifiers

This circuit corrects for low-frequency, including zero DC frequency, errors due to drift and imperfect internal amplification. Differential amplifier 10 amplifies a voltage wave appearing at input terminals 12 and 14 and delivers an output at terminals 16 and 18. The latter can be at ground potential as shown. Stabilizing amplifier 20 has input terminals connected to input terminals 12 and 14. The latter can be at floating ground potential at point 22 as shown. Amplifier 20 continuously monitors the total error, modifies it, and delivers it to capacitor 30. The voltage across capacitor 30 is the correction voltage for amplifier 10. Amplifier 20 is a floating chopper, stabilized narrow-band amplifier. Feedback can be incorporated in the system, treating both amplifiers 10 and 20 as single differential amplifiers, or can be incorporated in the stabilized amplifier 20 only.

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