Differential line driver
AssigneePagnanelli Family Trust
InventorChristopher Pagnanelli
Life of this patent
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Abstract
Provided are, among other things, systems, apparatuses, methods and techniques for driving a differential transmission line and an associated differential load. One such apparatus includes an input data line; an output data line; positive and negative supply rails; a pair of source termination resistors coupled to the positive supply rail; a first pair of n-channel transistors coupled to the source resistors and to the output data line; and a second pair of n-channel transistors coupled to the output line and to the negative supply rail.
Claims12
An apparatus for driving a differential transmission line and associated differential load, comprising:
- a differential input data line;
- a differential output data line;
- a positive supply rail and a negative supply rail;
- a pair of source termination resistors coupled to said positive supply rail;
- a first pair of transistors, each having a first terminal coupled to said differential input data line, a second terminal connected to said negative supply rail so that there is no substantial intermediate impedance, and a third terminal coupled to said output data line;
- a second pair of transistors, each having a first terminal coupled to said differential input data line, a second terminal coupled to said output data line, and a third terminal coupled to one of said source termination resistors,
- wherein each of said source termination resistors has an impedance that is approximately equal to the characteristic impedance of the differential transmission line and to the impedance of the associated differential load, and
- wherein each transistor within said first pair of transistors and said second pair of transistors is a n-channel device.
Dependencies are inferred from the claim text.