a-210.pdf | | FliOW HEWLETT
~e.. PACKARD
DIFFERENTIAL TDR USING A SINGLE STEP GENERATOR
Interest has been on the rise for making differential TDR measurements on
balanced systems like twisted pair cables, both shielded and unshielded, on
dual trace micros trip lines, and on dual conductor stripline. Under certain
conditions, such balanced transmission paths offer improved performance over
unbalanced lines, particularly in terms of common mode noise rejection and
immunity to crosstalk.
The question arises on whether standard TDR can be used effectively to analyze
balanced systems, and if so, how? This note explores these questions and will
describe how differential TDR is easily accomplished using a standard TDR if a
few special considerations are made. These are different considerations than
those required with dual step source differential TDR. Equivalent circuits of
dual and single step source TDR's are compare |