Copyright © SpectraDynamics, Inc. 2010
The 9.192 GHz Synthesizer CS-1 is made up of two separate units: the Synthesizer
Module and the DC Module.
The Synthesizer Module is a high stability and high resolution signal source designed to
be used in the implementation of a Cesium atomic clock. The unit is provided in a 2U,
19 inch rack-mount enclosure. All synthesizer functions are accessed from the front
panel or a RS232 interface. An external trigger input may be used to synchronize
programmable events such as frequency sweeps, phase modulation and amplitude
modulation with external events.
The synthesizer is implemented with a flexible modular topology. Two ultra-low noise
quartz oscillators are part of the multiplication chain from 5 MHz to 100 MHz. Buffered
outputs are provided at the front panel for 5 MHz, 10 MHz and 100 MHz. The 100 MHz
signal is the highest frequency in the low frequency section of the synthesizer. This 100
MHz signal is distributed using a 1 input, four output isolation amplifier. One of these
100 MHz signal is used as the reference for a 9.2 GHz DRO. The output of the 9.2 GHz
DRO is buffered and used to drive the LO port of a single-sideband mixer. The second
100 MHz signal is used to clock a DDS synthesizer module. The DDS synthesizer
generates a 7.xx MHz signal with 48 bit resolution and complete modulation
capabilities. The DDS synthesizer output drives the IF port of the single-sideband mixer.
The lower sideband of the mixer is selected as the output generating the 9.192 GHz
output signal. The amplitude of the 9.192 GHz output is controlled with 12 bits of
resolution and an internal relay may be used to turn off the RF signal.
The DC Module, also in a 2U, 19-inch rack-mount enclosure, provides the DC power to
the Synthesizer Module through DC cable.
SPECTRADYNAMICS,INC •1849 Cherry St. Unit 2 •Louisville, CO 80027 •Phone: (303) 665-1852 •Fax: (303) 604-6088
www.spectradynamics.com
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