Tektronix 071-0590-00 user manual Data and Clock Outputs, Overview

Reference

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 BAR	= NOT DATA
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.

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