Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Patent
1997-04-01
1998-10-06
Nelms, David C.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
327109, 327112, 327 55, G01R 1900
Patent
active
058182691
ABSTRACT:
A current mode driver capable of driving both 10 Base-T signalling and 100 Base-T signalling in a Local Area Network (LAN) includes two or four current sources. In a first embodiment, a differential signal generator drives four current sources. The generator outputs four signals, one of which is received by each current source. Using these signals, two of the current sources push or pull current across the load in one direction, while the other two current sources push or pull current across the load in the other direction, such that a full differential signal is generated across the load. In another embodiment, a signal generator drives two current sources which drive into the load one at a time. Two switches provide either high resistance or low resistance during half of a signal cycle such that current is pulled through the load in one direction, and prevented from flowing through the load in the other direction. When one current source turns on upon receipt of an input signal, one switch provides low resistance such that when the current source drives current into the load a voltage is generated across the load. At the same time, the other switch provides high resistance such that virtually no current is conducted. In this manner, only one current source pulls current across the load at a given time, while the other current source remains in a standby state.
REFERENCES:
patent: 4536662 (1985-08-01), Fujii
patent: 5376833 (1994-12-01), Chloupek
patent: 5408141 (1995-04-01), Devore et al.
patent: 5424662 (1995-06-01), Bonaccio
Brown Gary
Campbell John Andrew
Mohan Jitendra
National Semiconductor Corporation
Nelms David C.
Nguyen Hien
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