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Reference
3-12 GB1400 User Manual
Data and Clock Outputs
This section explains how to set up the Generator's clock and data outputs as well
as related pattern sync. and clock/4 outputs.
Overview
The OUTPUT section of the Generator front panel contains the instrument's main
NRZ (clock + data) outputs:
DATA
DATA-BAR
CLOCK
CLOCK-BAR
Note: The same term can be expressed three different ways.
CLOCK
= CLOCK BAR = NOT CLOCK
DATA
= DATA BAR = NOT DATA
DATA and CLOCK are the non-inverted test pattern outputs of the GB1400
Generator. DATA is a non-return to zero (NRZ) data signal and CLOCK is its
corresponding clock signal. DATA-BAR and CLOCK-BAR are complementary
outputs to DATA and CLOCK respectively. Thus the GB1400 can drive single-
ended or differential inputs.
The amplitude and baseline offset of the CLOCK and DATA outputs are
adjustable. This insures compatibility with a wide range of input circuit designs.
The selected clock amplitude applies to both CLOCK and CLOCK-BAR and the
selected data amplitude applies to both DATA and DATA-BAR.
Similarly the selected clock baseline offsets becomes the bottom (negative peak
voltage) of both the CLOCK and CLOCK-BAR outputs and the selected data
baseline offset becomes the bottom voltage of the DATA and DATA-BAR
outputs.
The nominal waveform and phase relationship of the four output signals is shown
in the figure below. An equivalent circuit model for these four outputs is shown
in the second figure.