Cryogenic transimpedance amplifier for micromechanical capacitive sensors.
We developed a cryogenic transimpedance amplifier that works at a broad range of temperatures, from room temperature down to 4 K. The device was realized with a standard complementary metal oxide semiconductor 1.5 mum process. Measurements of current-voltage characteristics, open-loop gain, input referred noise current, and power consumption are presented as a function of temperature. The transimpedance amplifier has been successfully applied to sense the motion of a polysilicon micromechanical oscillator at low temperatures. The whole device is intended to serve as a magnetometer for microscopic superconducting samples.
Antonio
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D
Centro Atomico Bariloche, 8400 S. C. de Bariloche, Argentina.
Pastoriza
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H
Julián
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Mandolesi
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