Device for the transmission of push-pull signals across a two-wire line in full duplex operation
US4112253A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1977 |
| Grant date | Sep 5, 1978 |
| Priority date | — |
| Expiry date | Jun 24, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/1423
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A device for the transmission of push-pull signals by way of a two-wire line in full duplex operation has a push-pull transmitter for the transmission of the push-pull signals to an opposite station and a push-pull receiver for the simultaneous reception of the push-pull signals transmitted from the opposite station, and a compensation circuit for compensating the push-pull signals transmitted from the associated push-pull transmitter in relation to the inputs of the push-pull receiver. The push-pull transmitter and the push-pull receiver are designed as symmetrical differential amplifiers composed of emitter-coupled transistors and are provided with a constant current feed. The compensation circuit is of symmetrical construction and inputs of the push-pull receiver are connected to the wires of the two-wire line by way of two identical decoupling resistors which form parts of the compensation circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.