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Micromachines 2019, 10(2), 88; https://doi.org/10.3390/mi10020088

Full-Differential Folded-Cascode Front-End Receiver Amplifier Integrated Circuit for Capacitive Micromachined Ultrasonic Transducers

Key Laboratory of Instrumentation Science & Dynamic Measurement, North University of China, Taiyuan 030051, Shanxi, China
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Received: 8 January 2019 / Revised: 21 January 2019 / Accepted: 24 January 2019 / Published: 25 January 2019
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Abstract

This paper describes the design of a front-end receiver amplifier for capacitive micromachined ultrasonic transducer (CMUT). The proposed operational amplifier (op amp) consists of a full differential folded-cascode amplifier stage followed by a class AB output stage. A feedback resistor is applied between the input and the output of the op amp to make a transimpedance amplifier. We analyzed the equivalent circuit model of the CMUT element operating in the receiving mode and obtained the static output impedance and center frequency characteristics of the CMUT. The op amp gain, bandwidth, noise, and power consumption trade-offs are discussed in detail. The amplifier was fabricated using GlobalFoundries 0.18-μm complementary metal-oxide-semiconductor (CMOS) technology. The open loop gain of the amplifier is approximately 65 dB, and its gain bandwidth product is approximately 29.5 MHz. The measured input reference noise current was 56 nA/√[email protected] MHz. The amplifier chip area is 325 μm × 150 μm and the op amp is powered by ±3.3 V, the static power consumption is 11 mW. We verified the correct operation of our amplifier with CMUT and echo-pulse shown that the CMUT center frequency is 3 MHz with 92% fractional bandwidth. View Full-Text
Keywords: CMUT; CMOS; operational amplifier; full-differential; transimpedance amplifier; parasitic capacitance; echo-pulse CMUT; CMOS; operational amplifier; full-differential; transimpedance amplifier; parasitic capacitance; echo-pulse
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Du, Y.; He, C.; Hao, G.; Zhang, W.; Xue, C. Full-Differential Folded-Cascode Front-End Receiver Amplifier Integrated Circuit for Capacitive Micromachined Ultrasonic Transducers. Micromachines 2019, 10, 88.

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