We describe a high-impedance audiofrequency preamplifier and present audiofrequency noise spectra for 2N4416 and U311 JFETs in a temperature range from room temperature to 80 K. It is found that optimum noise performance is obtained at −140°C. We present an analysis of some of the sources of noise. Amplifier input capacitance is also measured and discussed.
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Innes et al. (1985) studied this question.
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