Full-Differential Folded-Cascode Front-End Receiver Amplifier Integrated Circuit for Capacitive Micromachined Ultrasonic Transducers.
CMOS
CMUT
echo-pulse
full-differential
operational amplifier
parasitic capacitance
transimpedance amplifier
Journal
Micromachines
ISSN: 2072-666X
Titre abrégé: Micromachines (Basel)
Pays: Switzerland
ID NLM: 101640903
Informations de publication
Date de publication:
25 Jan 2019
25 Jan 2019
Historique:
received:
08
01
2019
revised:
21
01
2019
accepted:
24
01
2019
entrez:
30
1
2019
pubmed:
30
1
2019
medline:
30
1
2019
Statut:
epublish
Résumé
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/√Hz@3 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.
Identifiants
pubmed: 30691047
pii: mi10020088
doi: 10.3390/mi10020088
pmc: PMC6412642
pii:
doi:
Types de publication
Journal Article
Langues
eng
Subventions
Organisme : The National Key Research and Development Program of China
ID : 2016YFC0105004
Organisme : The National Science Foundation for Distinguished Young Scholars of China
ID : 61525107
Organisme : The Fund for Shanxi '1331 Project' Key Subject Construction
ID : 1331
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
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