Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2006-04-28
2008-07-15
Barnie, Rexford (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S058000, C326S086000, C326S087000, C326S115000
Reexamination Certificate
active
07400170
ABSTRACT:
A differential current-mode driver that meets the IEEE 1394 standard employs a wide output range in common-mode voltage, minimizes timing skew over this wide range, and has well-controlled rise/fall times in the edge rates of the digital signals transmitted, within the window specified by the IEEE 1394 standard, without having to resort to full-swing (VDDto VSS) gate drive signals. In a preferred embodiment PMOS and NPOS transistors are used to provide current for a current driver, in the form of a current steering switch switching a pair of current mirrors. The current mirrors output is input to a predriver waveform circuit which divides current between a data source A and data source B, forming the differential signal pair. Certain key transistors in the current driver are kept in saturation to improve performance. Upper and lower voltages used for the voltage swing necessary for the predriver waveform circuit and transmit driver are generated by P-channel and N-channel input opamps in a predriver reference generator circuit.
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Barnie Rexford
Crawford Jason M
LSI Logic Corporation
Suiter Swantz PC LLO
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