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Chapter 8: Theory of Operation
Agilent 1680A,AD-series Logic Analyzer Theory
Power Supply
A low voltage power supply provides all the DC voltages needed to operate the
logic analyzer. The power supply also provides the +5V VDC voltage to the probe
cables to power the logic analyzer accessories and analysis probes.
Unfiltered voltages of +12V, -12V, +5V, -5.2V, +3.4 V and +5V (standby) are
supplied to the power distribution board where they are filtered and distributed
to other boards and components in the system.
Acquisition Board
Logic Acquisition Board Block Diagram
Probing. The probing system consists of a tip network, a probe cable, and
terminations that reside on the analyzer board. Each probe cable is made up of
two ribbonized coaxial cables carrying 16 data channels and 1 clock/data channel.
Each channel of the probing system had its own ground. In addition, the pod has
a single ground. For applications where many channels are used (greater than
three) and signal times are less than 3 ns, individual channel grounds should be
used.