期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 68, 期 2, 页码 368-376出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2018.2849521
关键词
Analog circuits; charge amplifiers; differential amplifiers; preamplifiers; ultrasonic sensors
资金
- Texas Instruments Inc.
- project IMEROS, Regione Toscana FAS Salute
This paper presents a differential-input, differen tial-output charge amplifier topology built with discrete, commercial components. The amplifier is designed to interface highimpedance ultrasonic sensors made of piezoelectric polymer, with a required bandpass of at least 100 kHz to 1 MHz, and needs to operate from a single 5-V supply. The performance and tradeoffs of the proposed topology are evaluated analytically and using a circuit simulator, showing a charge-to-voltage conversion gain in excess of 240 dB[V/C], while maintaining an input impedance lower than 100 Omega. Simulations and measurements of a prototype implementation are presented.
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