An intelligent multiplexer/driver integrated circuit for an implantable multichannel blood flowmeter

A custom CMOS integrated circuit that extends the current implantable single-channel ultrasonic pulse Doppler blood flowmeter to three channels is discussed. By operating on a single 2.7-V battery with three existing custom bipolar ICs, the integrated circuit serves as an RF command receiver, contro...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 1990-04, Vol.25 (2), p.451-457
Main Authors: Yeung, K.-W.W., Meindel, J.D.
Format: Article
Language:English
Subjects:
Batteries
Biological and medical sciences
Bipolar integrated circuits
Blood
CMOS integrated circuits
Driver circuits
Investigative techniques of hemodynamics
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Miscellaneous
Multiplexing
Piezoelectric transducers
Power transistors
Pulse circuits
Radiofrequency integrated circuits
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Summary:A custom CMOS integrated circuit that extends the current implantable single-channel ultrasonic pulse Doppler blood flowmeter to three channels is discussed. By operating on a single 2.7-V battery with three existing custom bipolar ICs, the integrated circuit serves as an RF command receiver, controls the channel-multiplexing sequence, and multiplexes the piezoelectric transducers. A round-trip channel isolation of 38 dB is achieved with a novel transducer-multiplexing circuit that employs three on-chip power transistors for 6-MHz transducer excitation. Each power transistor is capable of switching a current of 200 mA with an on-resistance of 3 Omega and transition times of 10 ns. The power consumption in the implanted portion of the three-channel flowmeter is only 0.8 mW higher than the 30 mW in the single-channel flowmeter.< >
ISSN:0018-9200
1558-173X
DOI:10.1109/4.52169