H - Electricity – 04 – B
Patent
H - Electricity
04
B
340/72
H04B 15/00 (2006.01) H04B 3/28 (2006.01)
Patent
CA 1247205
NE-74 (011A/3) "Noise-Free Terminal Station Compatible with Existing Master Stations" ABSTRACT OF THE DISCLOSURE A terminal station operating with a current supplied from a master station exchanges signals with it through cable conductors, one of the cable conductors being grounded at the master station to allow the current to return from the terminal station. A receive circuit is formed by a first differential amplifier and a first resistor network connected in a balanced relationship to input terminals of the first differential amplifier for receiving a signal from the master station in a noise-cancelling relationship with respect to the ground potential to eliminate the effect of noise generated by the passage of the current through the ground conductor. A transmit circuit includes a second differential amplifier and a second resistor network connected in a balanced relationship to input terminals of the second differential amplifier for transmitting a signal to the master station in a noise cancelling relationship with respect to the ground potential to eliminate the effect of the noise at the output of the second differential amplifier.
509820
Corporation Nec
Smart & Biggar
LandOfFree
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