Interface chip for coupling modulated signals

Details Interface chip for coupling modulated signals Interface chip for coupling modulated signals

1990-09-14

1994-04-19

Eisenzopf, Reinhard J.

Telecommunications

Interference signal transmission

455 63, 455 73, 375 36, H04H 100

Patent

active

053054652

ABSTRACT:
An interface module may have a customized circuit to enable an operation using modulated signals, which are free of direct current, by way of a serial bus interface. To effect the communication, adapted connecting means are also needed to connect a subscriber to a two-wire line bus. An interface chip achieves a user friendly connection. Starting from its terminal side going toward the two-wire line bus the interface chip features a transformer and, with it, in series a parallel connection consisting of a receiver and a transmitter. Furthermore, in the interface chip, a comparator and a voltage source are provided, which transmit, as a function of the level of the modulated signals, a blocking signal to a circuit used to modulate and demodulate the signals. To release the signals to be transmitted, the customized circuit transmits an enabling signal to the transmitter. This design of the interface chip has the additional advantage of featuring electrical isolation between the subscriber and the two-wire line bus.

REFERENCES:
patent: 4429384 (1984-01-01), Kaplinsky
patent: 4797904 (1989-01-01), Dekker et al.
patent: 4881244 (1989-11-01), Haug
patent: 5140172 (1992-08-01), Flach
New Electronics, vol. 20, No. 18, Sep. 15, 1987; London, GB, pp. 21-23; A. Dench: "Components & Design Techniques for MIL-STD-1553B Implementation".
Elektronik, vol. 33, No. 12, Jun. 15, 1984, Munchen, DE, pp. 97-98; H. Abendroth: "Bus-Fahige Schnittstelle Nach RS 485/422".
Elektronik, vol. 35, No. 19, Sep. 19, 1986, Munchen, DE, pp. 146-148, 153-154; R. Wilson: "Hochleistungsnetze fur Peripheriegerate Aufbau von SCSI-und IPI-Schnittstellen mit RS-485 transceivern".

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