Chapter 3 69
Theory of Operation
Clock I/O
Clock I/O
10 MHz In
A 10 MHz reference is required when using the internal clock. You can use either
the (AutoSense) 10 MHz REF IN (the default) or the AUX 10 MHz REF IN
connector to supply the 10 MHz reference.
The high-performance 1.25 GHz oscillator provides the internal sample clock for
the module.
Internal Clock Out
The 1.25 GS/s low noise internal sample clock is output through the INT CLK OUT
connector and can be routed to other AWGs or test equipment. The internal clock
output is available even when an external clock is used.
External Clock
An external sample clock can be input through the EXT CLK IN connector. The
external sample rate must be within the range of 100 MS/s and 1.25 GS/s. To
achieve the optimal signal performance on the AWG 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.
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 87
and “Synchronization Using an External Clock” on page 88.
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