title: Cryogenic transimpedance amplifier for micromechanical capacitive sensors.
abstract: 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.
authors.affiliation: Centro Atomico Bariloche, 8400 S. C. de Bariloche, Argentina.
authors.forename: D
authors.initials: D
authors.lastname: Antonio
authors.forename: H
authors.initials: H
authors.lastname: Pastoriza
authors.forename: P
authors.initials: P
authors.lastname: Julián
authors.forename: P
authors.initials: P
authors.lastname: Mandolesi