Title :
A very small frequency generator system for spread spectrum EHF applications
Author :
Wolfson, Harry M.
Author_Institution :
MIT, Lincoln Lab., Lexington, MA, USA
Abstract :
The author reports on a novel synthesizer architecture utilizing a hybrid direct digital/direct analog approach, which was optimized for small size, fast tuning, low spurious, and low phase noise for a hopping EHF (extra-high-frequency) terminal. Performance data for the completed frequency generator system are presented and show 500-ns frequency switching speeds over a 600-MHz tuning bandwidth centered at 11.1 GHz, with 2.2-Hz resolution. Single-sided phase noise L(f) is less than -80 dBc/Hz at a 1-kHz offset from the 11-GHz output and the worst-case spurious is -40 dBc. The complete unit was packaged in 72 in 3, weighs 3.0 lb, and requires 16.5 W of DC power during continuous operation
Keywords :
frequency synthesizers; spread spectrum communication; 11 GHz; 11.1 GHz; 16.5 W; 600 MHz; extra-high-frequency; fast tuning; frequency generator system; hopping EHF; hybrid direct digital/direct analog; low phase noise; low spurious noise; small size; spread spectrum EHF applications; Bandwidth; Control system synthesis; Frequency synthesizers; Laboratories; Network synthesis; Phase locked loops; Phase noise; Spread spectrum communication; Tuning; Voltage-controlled oscillators;
Conference_Titel :
Military Communications Conference, 1989. MILCOM '89. Conference Record. Bridging the Gap. Interoperability, Survivability, Security., 1989 IEEE
Conference_Location :
Boston, MA
DOI :
10.1109/MILCOM.1989.104023
