DocumentCode :
2666803
Title :
Design and performance of an ultra-low phase noise, radar exciter
Author :
Driscoll, M.M. ; Hazzard, A.C. ; Opdycke, D.G.
Author_Institution :
Electron. Syst. Group, Westinghouse Electr. Corp., Baltimore, MD, USA
fYear :
1994
fDate :
1-3 Jun 1994
Firstpage :
647
Lastpage :
650
Abstract :
This paper reports on the design and performance of a radar exciter exhibiting state-of-the-art phase noise characteristics. The exciter provides fully coherent receiver local oscillator signals at HF, L-band, and X-band as well as requisite, auxiliary VHF and HF clock signals. Output signal spectral performance was achieved via use of a variety of recently-developed circuit technologies and frequency synthesis techniques. Included in these are use of multiple quartz crystals in the master oscillator, cascaded stages of narrowband, UHF SAW resonator filters, regenerative frequency division, and low noise, diode doubler and step recovery diode frequency multiplication. For the X-band outputs, the measured phase noise performance is given. Exciter output signal spectral performance in the presence of modest levels of mechanical vibration is also presented. Included in the vibration data are results of SAW resonator vibration sensitivity measurements for several different SAWR die designs. The data indicates large variations in SAWR vibration sensitivity values as well as spectral peaking in the fm=7 KHz carrier offset frequency region that is associated with SAWR mechanical mount resonances excited by environmental (sound level) stress and can be suppressed via acoustic shielding
Keywords :
acoustic microwave devices; microwave devices; phase noise; radar equipment; resonators; signal generators; surface acoustic wave resonator filters; 7 kHz; CW signal generator; HF clock signals; L-band; SAWR mechanical mount resonances; SAWR vibration sensitivity; UHF SAW resonator filters; X-band; acoustic shielding; auxiliary VHF; diode doubler; environmental sound level stress; frequency synthesis; multiple quartz crystals; output signal spectral performance; radar exciter; regenerative frequency division; spectral peaking; state-of-the-art phase noise characteristics; step recovery diode frequency multiplication; ultra-low phase noise; Diodes; Frequency conversion; Hafnium; L-band; Local oscillators; Phase noise; Radar; Surface acoustic waves; VHF circuits; Vibration measurement;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Frequency Control Symposium, 1994. 48th., Proceedings of the 1994 IEEE International
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-1945-1
Type :
conf
DOI :
10.1109/FREQ.1994.398268
Filename :
398268
Link To Document :
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