Transmit and receive protection circuit

Details Transmit and receive protection circuit Transmit and receive protection circuit

2005-12-06

2005-12-06

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Miscellaneous

C307S029000, C307S036000, C307S098000, C307S128000, C307S154000, C327S061000, C327S337000

Reexamination Certificate

active

06973153

ABSTRACT:
A transmit and receive protection circuit for use in a communication system is disclosed. The protection circuit uses a four-diode gate in which the currents through an input portion and an output portion of the diode gate are individually controlled by resistors located in their respective portions. This arrangement allows the DC currents through each portion to be independently controlled. By using resistors to independently control the DC currents through each portion of the diode gate, better control over the individual DC currents can be achieved, leading to effective AC resistances which are more predictable. This arrangement results in a predictable low loss protection circuit at a minimal expense.

REFERENCES:
patent: 3628055 (1971-12-01), Lum
patent: 3671774 (1972-06-01), Millman
patent: 4453091 (1984-06-01), Katakura et al.
patent: 5006734 (1991-04-01), Engelbrecht
patent: 5124578 (1992-06-01), Worley et al.
patent: 5640127 (1997-06-01), Metz
patent: 5994929 (1999-11-01), Sano et al.
patent: 6140858 (2000-10-01), Dumont
patent: 6396327 (2002-05-01), Lam
patent: 6639772 (2003-10-01), Chuang et al.

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