Analog line connection

Details Analog line connection Analog line connection

1990-11-19

1992-02-25

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Nonreciprocal gyromagnetic type

333100, 330195, 455 5, H03H 500, H03F 1100

Patent

active

050917030

ABSTRACT:
An analog line connection circuit provides that the transmission voltage is not superimposed on the received voltage given a data transmission in duplex operation via a two-wire line. The line connection circuit is provided with an amplifier that comprises two symmetrical outputs, the first of these outputs being connected via a first ohmic connecting resistor to a first terminal of a first winding of a transformer and the second output being connected via a second ohmic connecting resistor to a second terminal of the first winding of the transformer. The transformer comprises a second winding connected to a transmission line. A series circuit of a first auxiliary resistor, a complex impedence and a second auxiliary resistor is connected between the outputs of the amplifier. The two ohmic voltage dividers are respectively arranged cross-connected between a terminal point of the first winding of the transformer and a junction of an auxiliary resistor with the complex impedance, the received voltage being output at the outputs of these ohmic divider resistors for a receiver unfluenced by the transmission voltage.

REFERENCES:
Hubner et al., "Digitale Duplex-Zweidrahtubertragung nach dem Prinzip der Adaptiven Echokompensation", Nachrichtentech., Electron, vol. 34, No. 8, pp. 303-306.
Fisk et al., "Balanced Electronic Hybrid Circuits", IBM Technical Disclosure Bulletin, vol. 16, No. 2, 1973, pp. 495-496.
Trick, U., "Ein Vergleich von Integrierten Schaltunger fur die U-Schnittstelle in Digitalisierten Ortsnetz", NTZ Archiv. Bd., vol. 11, No. 5, 1989, pp. 211-219.

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