Keysight N5990A MIPI M-PHY Receiver Test User Guide
135
Calibrations
4
Procedure
The pattern generator data outputs are connected to the DSO channels
with a ISI board between them.
The generator does a sweep of the differential voltage amplitude, starting
with the default Differential Voltage Start Value (400 mV) and is decreased
by a Step Size value. At each step, the eye is centered using the histogram
of the DSO and the two amplitude measurements are taken using the
upper and lower part of the eye. The smallest amplitude value between the
two measurements is saved for each step.
Connection Diagram
Refer to the connection diagrams shown in the Connection Diagram
section of the ISI (w/Switch) Calibration test.
Parameters
The parameters used in
Expert Mode
for this procedure, are as follows:
• Lane Under Test Termination Mode
• Oscilloscope Bandwidth
• Differential Voltage Start Value
• Step Size
• Number of Histogram Hits
• Total Jitter
• SI (p-p)
• Minimum Accumulated Differential Voltage
• Use Infiniisim
• Transfer Function Chan2
• Filter Delay Chan2
• Max Time Span Chan2
WARNING
If the calibration fails and shows the message "Levels for Eye Opening
according to Specification 40mV were not reached", the Differential
Voltage Start Value must be increased to reach the Minimum Accumulated
Differential Voltage value (default value, 40 mV). Due to the increased
differential voltage, the DUT could be damaged due to the violation of the
Maximum Differential Voltage value while running the Test 2.1.2, HS-RX
Accumulated Differential Input Voltage Tolerance Test.
Summary of Contents for N5990A
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