We describe the design, schematics, and performance of a very low-noise FET cascode input amplifier. This amplifier has noise performance of less than 1.2 nV/(Hz)1/2 and 0.25 fA/(Hz)1/2 over the 500 Hz to 500 kHz frequency range. With modest changes it could be extended to a wide variety of uses requiring low-noise gain in the 1 Hz to 30 MHz frequency range.
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Jefferts et al. (1989) studied this question.
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