Implantable stimulation device having a low noise, low power, precision amplifier for amplifying cardiac signals
US5573550A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1995 |
| Grant date | Nov 12, 1996 |
| Priority date | — |
| Expiry date | Apr 28, 2015 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N1/3704
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An implantable stimulation device has a sensing amplifier circuit for amplifying low amplitude cardiac signals, while maintaining low power, to produce an output signal having a low noise level. The sense amplifier circuit includes a two-stage amplifier, a bandpass filter, and a threshold detector. The first stage comprises a linear differential amplifier which has low gain, good common mode rejection, and a current consumption proportional to the gain. The second stage is a switched-capacitor amplifier which has a programmable gain and low current consumption. The noise content of the system is low and produced substantially entirely in the switched-capacitor amplifier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.