Electricity: power supply or regulation systems – In shunt with source or load – Using a three or more terminal semiconductive device
Patent
1997-11-06
1999-08-31
Wong, Peter S.
Electricity: power supply or regulation systems
In shunt with source or load
Using a three or more terminal semiconductive device
323284, 323269, 326 30, 257529, H02J 102, G05F 1613, H04B 300
Patent
active
059458143
ABSTRACT:
A low voltage high current bi-directional termination voltage regulator for use in a bus termination circuit in a repeater stack is disclosed that includes an operational amplifier, a bipolar transistor current source circuit, and a bipolar transistor current sink circuit. The operational amplifier is configured to source current to a first node when the output voltage at a second node is pulled below a nominal termination voltage and configured to sink current from the first node when the output voltage at the second node is pulled above the nominal termination voltage, the second node being connected to a termination load. The bipolar transistor current source circuit is configured to source current to the second node when the operational amplifier sources current to the first node so that the output voltage at the second node is pulled up as a result of the current sourced by the bipolar transistor current source circuit through the second node to the termination load. The bipolar transistor current sink circuit is configured to sink current from the second node when the operational amplifier sinks current from the first node so that the output voltage at the second node is pulled down as a result of the current sinked by the bipolar transistor current source circuit through the second node from the termination load. Thus, the output voltage at the second node is maintained at the nominal termination voltage.
REFERENCES:
patent: 3675114 (1972-07-01), Nercessian
patent: 4982314 (1991-01-01), Miki
patent: 5381034 (1995-01-01), Thrower et al.
patent: 5608312 (1997-03-01), Wallace
Network Systems Tutorial for IEEE Std 802.3, Repeater Functions and System Design Topology Considerations for Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Local Area Networks (LANs); Section 4, Repeater Functions, pp. 7-14 (1995).
International Standard ISO/IEC 8802-3: 1996(E) ANSI/IEEE Std 802.3, 1996 Edition; Carrier sense multiple access with collision detection (CSMA/DC) access method and physical layer specifications; Section 9, Repeater unit for 10 Mb/s baseband networks, pp. 125-155.
Cisco Technology Inc.
Patel Rajnikant B.
Wong Peter S.
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