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Functional Overview
GB1400 User Manual 2-3
DATA
CLOCK
Falling edge of CLOCK
in middle of DATA "eye"
Rising edge of CLOCK Coin-
cident with DATA transitions
Figure 2-2. Nominal Generator NRZ Data and Clock Output
Waveforms
The nominal Generator clock/data phase relationship is fixed so that the falling
edges of the clock signal occur in the middle of bit time slots of the data signal.
The amplitude and baseline offset of the Generator's clock and data outputs are
adjustable to insure compatibility with a wide range of input circuit designs and
logic families including ECL, positive ECL, and GaAs.
The GB1400 Analyzer, also known as the receiver or "Rx", can terminate and
analyze the NRZ output of a digital device, module, or system being tested by the
GB1400 Generator or an equivalent signal source. The decision voltage or
threshold of the Analyzer DATA and CLOCK inputs can be adjusted to
accommodate different logic families. The Analyzer can also add a variable
amount of delay to the input data signal to accommodate different clock/data
phase relationships at the output of the device under test.
The primary measurements made by the GB1400 Analyzer are bit errors and bit
error rate.