Negative inductance multiplier circuit including temperature compensation
US4463307A · kind A · utility
7Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1982 |
| Grant date | Jul 31, 1984 |
| Priority date | — |
| Expiry date | Oct 26, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F27/42
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for increasing the inductance of a transformer as used in a telephone line circuit. An operational amplifier with appropriate feedback is connected across a separate winding of the transformer to provide the reactive inductance. To compensate for changes in resistance of the winding, a field effect transistor is controlled by the same amplifier output to provide a positive resistance in the feedback path and thus maintain balance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.