Integrated circuit arrangement for a telephone subscriber station
US3955053A · kind A · utility
5Cited by
5References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 8, 1974 |
| Grant date | May 4, 1976 |
| Priority date | — |
| Expiry date | Aug 8, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/585
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An integrated circuit construction for a telephone subscriber station having a microphone amplifier and a receiving audio amplifier is described. An impedance bridge replaces the conventionally used hybrid transformer. The aforementioned amplifiers are constructed in integrated circuit form as differential amplifiers, which are excited in parallel by separate reference voltages produced from two constant currents generated in a common source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.