Specifications

Chapter 7: Theory of Operation
Oscillator Assembly
129
Oscillator Assembly
The oscillator assembly consists of an oscillator board; one or two DROs (dielectric
resonator oscillators), depending on the oscilloscope’s model; two SMA connectors for
the 100 MHz clock; two BNC connectors for the 10 MHz clock; and a connector to the
backplane board.
The timebase distribution system described in the previous section is driven by a
precision low- jitter 10 GHz clock generation system. The 90000 Q- Series clock generation
system is comprised of the oscillator board and the 10 GHz DRO.
The 10 GHz sample clock is generated with a DRO that is phase- locked to a 100 MHz
reference signal. This signal can be selected from either an internal oscillator or an
external 100 MHz reference signal input. The internal oscillator’s 10 MHz reference
input can be selected from either an internal oven- controlled crystal oscillator located
on the oscillator board or from an external 10 MHz signal input. See Figure 7- 8.
Figure 7-8 Oscillator Assembly
The external 10 MHz reference is applied through a rear- panel BNC connector and runs
to the backplane assembly. Users can select between an internal and external reference
through a dialog box in the oscilloscope application.
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