Low-power A/D converter for an implantable medical device and method of use
US5052389A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1990 |
| Grant date | Oct 1, 1991 |
| Priority date | — |
| Expiry date | Jul 26, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/37211
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A low-power A/D converter for an implantable medical device. The converter includes a high-frequency oscillator capable of generating clock pulses at a frequency substantially higher than the main clock frequency of the implantable device, and an oscillator-gating circuit for enabling the oscillator for a voltage-dependent variable time interval. The gating circuit includes a voltage-controlled monostable multivibrator for generating a gate control pulse having a pulse width corresponding to the value of an analog signal representative of a physiological parameter sensed by the implantable device. A timing controller, which operates at a low frequency under control of a crystal-controlled clock, supplies a trigger pulse to the voltage-controlled monostable at a predetermined first point in the variable time interval and generates an enable pulse at a predetermined second point in the variable time interval. In response to the enable pulse, the A/D converter enables the oscillator at the second point and, in response to the gate control pulse, disables the oscillator at the end of the variable time interval. A counter coupled to the oscillator counts the clock pulses generated betwe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.