How the Instrument Works
System Architecture
The HP 54701A has sucient bandwidth (2.5 GHz), suciently small
capacitive loading (0.6 pF), and suciently high resistance (100 k) to be
useful for both ECL and CMOS circuits, and for most analog circuits.
For the high-speed CMOS state machine in the example, the HP 54701A
active probe oers the best combination of measurement accuracy with
minimal circuit loading.
Figure
13-11. Active
probe.
13-20