SDI FS100-RM Instrukcja Użytkownika Pobierz pdf (Strona 53)

6.834 GHz FREQUENCY SYNTHESIZER, RB-1

DESCRIPTION

The 6.834 GHz Synthesizer, RB-1 is a high stability and high resolution signal source designed to be used in the

implementation of a Rubidium atomic clock. The RB-1 is provided in two separate enclosures, the Synthesizer

Module and the DC Module, both 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 signals. The 100 MHz signal is the highest frequency in the low frequency section of the

synthesizer. This 100 MHz signal is distributed using a one input, four output isolation amplifier. One of these

100 MHz signals is used as the reference for a 6.8 GHz DRO. The output of the 6.8 GHz DRO is buffered and

used to drive the LO port of a single-sideband mixer. The second 100 MHz signal is used to generate the 200

MHz clock for the DDS synthesizer module. The DDS synthesizer generates a 34.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 upper sideband of the mixer is selected as the output generating the 6.834 GHz output

signal. The amplitude of the 6.834 GHz output is controlled with 12 bits of resolution and an internal relay may

be used to turn off the RF signal.

FEATURES

 Output signals: 5 MHz, 10 MHz, 100 MHz, 34 MHz,

6.8 GHz, 6.834 GHz.

 Synchronization capabilities with external events:

Frequency sweeps

Phase modulation

Amplitude modulation

 Low phase noise

APPLICATIONS

 Atomic frequency standards

 Atomic time scales

 Reference frequency generation

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SDI FS100-RM Instrukcja Użytkownika Strona 53