Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Current driver
Reexamination Certificate
2007-07-10
2007-07-10
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Current driver
C327S379000, C327S170000
Reexamination Certificate
active
10979696
ABSTRACT:
A differential bus network, in general, or a controller area network (CAN) driver, in particular, controls and minimizes the variation on the common-mode signal of the CAN bus. This CAN driver also provides improved symmetry between its differential output signals, CANH and CANL, and provides protection for its low voltage devices from voltage transients occurring on its output lines. The common-mode signal is sensed and buffered, then during the dominant to recessive transition, the bus signals are shorted to the buffered common mode voltage. Specifically, additional switches or transistors are used to pull the differential output signals, CANH and CANL, to the common mode signal VCMwhen the state of the CAN bus transitions from dominant to recessive. This improvement minimizes high frequency spikes in the common-mode signal and eliminates DC shifts during transitions of the state of the CAN bus. A driver system may include a plurality of CAN drivers are serially interconnected to form a driver system, wherein each downstream driver stage receives a time-delayed form of the digital input signal TxD, each stage providing a time-delayed contribution to the differential output signals of the overall driver system.
REFERENCES:
patent: 5448180 (1995-09-01), Kienzler et al.
patent: 6324044 (2001-11-01), Teggatz et al.
patent: 6366130 (2002-04-01), Podlesny et al.
patent: 6922073 (2005-07-01), Haase et al.
Carpenter, Jr. John H.
Chen Wayne Tien-Feng
Pauletti Timothy P.
Brady III W. James
Jager Ryan C.
Kempler William B
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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