Vertical optimization procedure for an integrated micropower signal preprocessor
Abstract
The need for low power operation is characteristic of all electronic measurement systems that transmit physiological data across the intact skin. Custom integrated circuits and hybrid microcircuit assembly techniques leave battery volume (or power drain) as the limiting factor for implanted-system lifetime and animal model size. First generation totally implantable Doppler blood flowmeters, telemeter Doppler-shifted signals having a 40 kHz bandwidth. External electronics are then used to convert this information into a flow signal with a maximum bandwidth of approximately 100 Hz. A vertically optimized system circuit device procedure utilizes a digital data link for telemetry to reduce flowmeter transmitter power consumption. In this CW Doppler ultrasonic flowmeter, a potential 400:1 reduction in FM transmitter power is possible through additional signal preprocessing in the implanted package. A 10:1 savings in transmitter power drain is realized by a novel preprocessor developed to encode and telemeter pulsed digital data rather than Doppler signals.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- June 1980
- Bibcode:
- 1980PhDT........98H
- Keywords:
-
- Blood Flow;
- Flowmeters;
- Integrated Circuits;
- Microelectronics;
- Signal Processing;
- Application Specific Integrated Circuits;
- Bandwidth;
- Doppler Effect;
- Optimization;
- Telemetry;
- Instrumentation and Photography