An Improved dc Amplifier for Portable Ionization Chamber Instruments

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Abstract
It is widely recognized that the zero stability of dc amplifiers for measuring currents in the micro-micro-ampere region can be enhanced by the application of negative feed-back. The promised advantages are often not fulfilled, however; and a design approach which emphasizes the economic exchange of amplifier gain for these benefits is outlined. In portable battery-operated ionization chamber instruments, which are the main concern of this paper, it is not easy to achieve the loop gain needed for optimum performance; and a subsidiary reflexing scheme is adopted to overcome the limitation. In conclusion a practical instrument incorporating this improved circuit receives brief discussion and performance figures are given.
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