Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
1999-10-12
2001-04-17
Lee, Benny (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S259000
Reexamination Certificate
active
06218901
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a high speed differential output driver with increased voltage swing and predrive common mode adjustment.
DESCRIPTION OF THE RELATED ART
In systems with power supply voltages for microprocessors shrinking faster than for supporting circuitry, there is a need for output drivers that can send, signals to receivers on both the lower supply chips and the higher supply chips. With the receiver switching thresholds on these two extremes being at significantly different voltages, a signal must have an amplitude that crosses through both thresholds with relatively little delay in between.
A need exists for a driver having a lower common mode level and a large signal swing, while maintaining fast rise/fall times which minimizes system skew.
SUMMARY OF THE INVENTION
A principal object of the present invention is to provide a high speed differential output driver with increased voltage swing and predrive common mode adjustment.
In brief, a high speed differential output driver is provided with increased voltage swing and predrive common mode adjustment. The high speed differential output driver includes a differential input with a voltage amplifier receiving the differential input signal and a common mode adjustment signal and providing an adjustable voltage amplified signal. An emitter follower is coupled to the voltage amplifier. The emitter follower provides a level shifted voltage amplified signal. A driver is coupled to the emitter follower receiving the level shifted voltage amplified signal and providing a driver output signal.
REFERENCES:
patent: 4904953 (1990-02-01), McCormack
patent: 5254956 (1993-10-01), Nishijima
patent: 5798664 (1998-08-01), Nagahori et al.
patent: 5898341 (1999-04-01), Miyashita
Lukes Eric John
Strom James David
Woeste Dana Marie
Choe Henry
International Business Machines - Corporation
Lee Benny
Pennington Joan
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