Electronic digital logic circuitry – Signal sensitivity or transmission integrity – Bus or line termination
Reexamination Certificate
2005-08-30
2005-08-30
Tran, Anh Q. (Department: 2819)
Electronic digital logic circuitry
Signal sensitivity or transmission integrity
Bus or line termination
C326S032000, C326S033000
Reexamination Certificate
active
06937056
ABSTRACT:
An active terminating device (30) for an electrical transmission line with optional line-receiving and line-driving capabilities. The basic device is a two-terminal unit, denoted as a Signal Canceling Unit (SCU), which sensesthe signal available at its terminals (34a,34b), and applies negative feedback in order to cancel and absorb the signal. When applied to the end of a transmission line (15a,15b) as part of wired communication network, the SCU functions as a terminator. When connected in the middle of such wired transmission line, the SCU splits the transmission line into two separate and isolated segments. In such a configuration, the SCU can be used to isolate a portion of a network from signal degradation due to noise or bridge-tap. Furthermore, the two isolated segments may each employ independent communications, such that no interference exists between the segments. In another embodiment, line receiver functionality is integrated into the SCU, designated as a Signal Canceling and Receiving Unit (SCRU) (90). The SCRU can perform all the SCU functions, and also serves as a line receiver in the communication network. In yet another embodiment, line driver functionality is integrated into the SCRU, designated as a Signal Canceling, Receiving and Transmitting Unit (SCRTU) (120). The SCRTU can perform all the SCRU functions, and also serves as a line driver in the communication network. Upon connecting multiple SCRTU's to a continuous transmission line, terminated independent point-to-point communication segments are formed.
REFERENCES:
patent: 5530377 (1996-06-01), Walls
patent: 5608312 (1997-03-01), Wallace
patent: 5793223 (1998-08-01), Fankeny
patent: 6425025 (2002-07-01), Kamepalli
“Active Termination of a high-speed, multi-drop, Bidirectional Digital Transmission System”, IBM Technical Cisclosure Bulletin, IBM Corp. New York, US, Aug. 1, 1990, pp. 301-303.
“Active Termination for Transmission Line”Database IBM TDB ‘Online! IBM’; IBM Technical Disclosure Bulletin, Mar. 1986 XP002210580, whole document.
Browdy and Neimark PLLC
Serconet Ltd.
Tran Anh Q.
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