Noise free transceiver circuit

Details Noise free transceiver circuit Noise free transceiver circuit

2007-01-16

2009-11-10

Tan, Vibol (Department: 2819)

Pulse or digital communications

Cable systems and components

C375S256000, C375S219000

Reexamination Certificate

active

07616694

ABSTRACT:
A noise free transceiver circuit includes a communication line, a power source line, a ground line, an output transistor having output terminals connected between the communication line and the ground line for outputting a communication signal to the communication line, a first circuit for applying a trapezoidal signal to the input terminal of the output transistor to turn on in synchronism with a transmission signal and a second circuit for turning off the output transistor when the level of the transmission signal is high. The output transistor is turned off when the communication signal is outputted. Therefore, noises of the power line are shut out of the output transistor.

REFERENCES:
patent: 4320521 (1982-03-01), Balakrishnan et al.
patent: 4896333 (1990-01-01), Can
patent: 4988958 (1991-01-01), Tsuruoka et al.
patent: 6269388 (2001-07-01), Pioppo
patent: 6518803 (2003-02-01), Nagata et al.
patent: 7221224 (2007-05-01), Koyasu
patent: 7248634 (2007-07-01), Koyasu
patent: 2004/0141560 (2004-07-01), Koyasu

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