Chopper-stabilized instrumentation amplifier for impedance measurement
US9197173B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 2009 |
| Grant date | Nov 24, 2015 |
| Priority date | — |
| Expiry date | Feb 22, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2203/45551
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
This disclosure describes a chopper stabilized instrumentation amplifier. The amplifier is configured to achieve stable measurements at low frequency with very low power consumption. The instrumentation amplifier uses a differential architecture and a mixer amplifier to substantially eliminate noise and offset from an output signal produced by the amplifier. Dynamic limitations, i.e., glitching, that result from chopper stabilization at low power are substantially eliminated through a combination of chopping at low impedance nodes within the mixer amplifier and feedback. The signal path of the amplifier operates as a continuous time system, providing minimal aliasing of noise or external signals entering the signal pathway at the chop frequency or its harmonics. The amplifier can be used in a low power system, such as an implantable medical device, to provide a stable, low-noise output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.