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  • Title: Differential automatic zero-adjusting amplifier.
    Author: Broersen B, Van Krevelen F, van Heusden JT, van Heukelom JS.
    Journal: Rev Sci Instrum; 1979 Jul; 50(7):897-9. PubMed ID: 18699627.
    Abstract:
    A method is described for building a low-voltage-drift differential dc amplifier featuring automatic zero adjustment, a high input impedance, and a bandwidth of 10 kHz. This is achieved by an asymmetric two-step process between the input signal and ground. Bandwidth can be extended by the use of a second amplifier during the ground-sampling time. The amplifier can be made with standard electronic components. A major advantage of this method is that an existing amplifier can easily be converted into a low-voltage-drift amplifier by adding the essential elements of the described automatic zero-adjusting amplifier to its input stage. To illustrate the method a practical example is constructed featuring a drift of 0.2 microV/ degrees C.
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