Chapter 3
61
Theory of Operation
Theory of Operation
T
h
eo
ry o
f Oper
ation
Internal Clock
The high-performance 1.25 GHz oscillator provides the internal sample
clock for the module.
External Clock
An external sample clock can be input through the EXT CLK IN connector.
The external sample rate must be between 100 MS/s and 1.25 GS/s. To
achieve the optimal signal performance on the N6030A analog output, use
an external clock with a phase noise floor below -155 dBc/Hz and a power
setting of approximately 0 dBm.
NOTE
An error message will appear if the clock rate does not match the hardware
setting, or an external clock is not present.
Internal Clock Out
The 1.25 GS/s low noise internal sample clock is output through the INT
CLK OUT connector and routed to other AWGs or test equipment.
SYNC Clock In/SYNC Clock Out
The SYNC CLOCK IN and SYNC CLOCK OUT are used for the
synchronization of multiple modules. Refer to
“Synchronization Using an
Internal Clock” on page 78
and
“Synchronization Using an External Clock”
on page 79
.
Waveform Playback
Waveforms
Single waveforms are played back in one of two modes:
•
Continuous
The waveform repeats indefinitely.
•
Burst
Once a trigger is received, the waveform repeats a specified number of
times.
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