{"title":"An intelligent multiplexer/driver integrated circuit for an implantable multichannel blood flowmeter","authors":"K.-W.W. Yeung, J. Meindl","doi":"10.1109/CICC.1989.56734","DOIUrl":null,"url":null,"abstract":"A custom intelligent multiplexer/driver (IMD) IC was designed for use with an implantable three-channel ultrasonic pulsed Doppler blood flowmeter. It also facilitated the development of a system architecture for the three-channel flowmeter by adding only 0.8 mW to the 30 mW of power consumption in the implanted portion of the single-channel flowmeter. By sending RF command signals to the implanted electronics, the flowmeter can operate in either the single- or multichannel mode. A unique transducer multiplexing circuit was incorporated on the IMD to obtain a round-trip channel isolation of 38 dB while operating on a 2.7 V battery. This channel isolation is an order of magnitude superior to that obtained by an earlier approach. A power transistor was fabricated (on the IMD) with standard MOS processes to achieve an on-resistance of 3 Ω (at a gate-source voltage of 2.7 V) and rise and fall times of 10 ns for 6-MHz transducer excitation","PeriodicalId":165054,"journal":{"name":"1989 Proceedings of the IEEE Custom Integrated Circuits Conference","volume":"232 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1989-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1989 Proceedings of the IEEE Custom Integrated Circuits Conference","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CICC.1989.56734","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 1
Abstract
A custom intelligent multiplexer/driver (IMD) IC was designed for use with an implantable three-channel ultrasonic pulsed Doppler blood flowmeter. It also facilitated the development of a system architecture for the three-channel flowmeter by adding only 0.8 mW to the 30 mW of power consumption in the implanted portion of the single-channel flowmeter. By sending RF command signals to the implanted electronics, the flowmeter can operate in either the single- or multichannel mode. A unique transducer multiplexing circuit was incorporated on the IMD to obtain a round-trip channel isolation of 38 dB while operating on a 2.7 V battery. This channel isolation is an order of magnitude superior to that obtained by an earlier approach. A power transistor was fabricated (on the IMD) with standard MOS processes to achieve an on-resistance of 3 Ω (at a gate-source voltage of 2.7 V) and rise and fall times of 10 ns for 6-MHz transducer excitation