Amplifier arrangement with suppression of spurious signals
US4263561A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1979 |
| Grant date | Apr 21, 1981 |
| Priority date | — |
| Expiry date | Jul 5, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/45991
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
For the common mode rejection in an amplifier arrangement comprising preferably a plurality of operational amplifiers for a plurality of desired signals to be processed, which signals are superimposed by a stronger spurious signal, it is an object to supply the desired signals such as physiological measuring signals for EEG and EKG measurements at positive inputs of the respectively associated single amplifiers, while each negative input is connected to the junction of a voltage divider consisting of two resistors, which voltage divider is arranged between the respective amplifier output and a reference potential. This reference potential is determined by the output of an additional operational amplifier, to the positive input of which a desired signal superimposed by the same spurious signal is applied, while the negative input thereof is connected to the junction of a voltage divider consisting of two resistors, which voltage divider is connected between the output of the additional operational amplifier and the reference potential. Accordingly, in signal amplifiers for measuring purposes such as for physiological measuring signals the common mode rejection is already achieved in…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.