A Low Noise Cascode Amplifier
نویسنده
چکیده
A low noise amplifier has been designed using a 2SK117 N channel J-FET as the input device in a cascode [1] configuration. Noise measurements on this amplifier yield a low frequency noise current of 0.25 fA/Yfu and a voltage noise of less than 1.2 n V NHz in the 500 Hz to 50 kHz region. Bloyet et al. [2] suggest a figure of merit of the product of the noise voltage and current as being appropriate for amplifiers of this type. This amplifier has a figure of merit of ,..., 3 X 10-25 W /Hz, which is almost two orders of magnitude smaller than other amplifiers reported elsewhere. [2] The amplifier described here is presently being used in conjunction with a Penning trap to detect small image currents ( ....... 0.01 pA) induced by ion motion in the trap. [3] This amplifier also appears to be well suited for use in noise thermometry experiments. [4]
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