Dynamic swing voltage adjustment

Details Dynamic swing voltage adjustment Dynamic swing voltage adjustment

2000-09-29

2004-02-17

Tran, Anh (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S032000, C326S033000, C326S034000, C326S087000

Reexamination Certificate

active

06693450

ABSTRACT:

BACKGROUND
This invention relates to dynamic output impedance adjustment.
A driver is a digital electronic circuit for holding a binary value, and communicating it to other circuits to which it is connected. The binary value is represented by a voltage level. It is common to connect a driver to a data bus for communicating the binary value to a receiving circuit by “driving” the bus to a desired voltage level. In a typical parallel interface, one of the voltage levels (HIGH or LOW) is a power rail voltage, and the other voltage signal is a “swing voltage” away from the power rail voltage. That is, the difference between a voltage HIGH signal on bus line and a voltage LOW signal is called the “signal swing.”
The driver has an inherent output impedance. The driver's output impedance when driving the bus to a voltage HIGH level may differ from the driver's output impedance when driving the bus to a voltage LOW level. In addition, the bus has an inherent transmission line or characteristic impedance, and the receiving end of a parallel-terminated system has an input impedance, called the termination impedance. To obtain a high rate of data transfer on the bus, the characteristic impedance should closely match the termination impedance.


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