Keysight E8267D User Manual page 296

Peripheral Devices
N5102A Digital Signal Interface Module
Clock Timing for Parallel Interleaved Data
The N5102A module provides the capability to interleave the digital I and Q
samples. There are two choices for interleaving:
— IQ, where the I sample is transmitted first
— QI, where the Q sample is transmitted first
When parallel interleaved is selected, all samples are transmitted on the I data
lines. This effectively transmits the same number of samples during a sample
period on half the number of data lines as compared to non-interleaved
samples. (A sample period consists of an I and Q sample.) Clocks per sample is
still a valid parameter for parallel interleaved transmissions and creates a
reduction in the sample rate relative to the clock rate. The clocks per sample
selection is the ratio of the reduction.
sample selections, for a parallel IQ interleaved port configuration, using a word
sized of four bits and the clock timing relative to the I and Q samples. For a
parallel QI interleaved port configuration, just reverse the I and Q sample
positions. For input mode, the clocks per sample setting is always one.
Figure 12-5 Clock Timing for a Parallel IQ Interleaved Port Configuration
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The I sample is transmitted on one clock transition and the Q sample is transmitted on the
other transition; the sample and clock rates are the same.
1 Sample Period
1 Clock
Clock
Q sample
I sample
4 bits per word 4 bits per word
Figure 12-5 shows each of the clocks per
1 Clock Per Sample
Keysight E8357D/67D & E8663D PSG User's Guide