ULTRA WIDEBAND DIGITAL DELAY LINE
ROME AIR DEVELOPMENT CENTER GRIFFISS AFB NY
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The report presents the detailed technical analysis, experimental results, and problems encountered in the design and construction of a four-bit digital delay line having an instantaneous, nondispersive, and lossless bandwidth of 400 mcs. The frequency range covered was from 50 to 450 mcs. The signal was switched either through or around the different time delay elements. The switches consisted of wideband amplifiers which minimize amplitude and phase fluctuations across the band and between the different signal paths. Switching was performed by purely electronic means with switching time less than 50 nanoseconds. Amplitude variations up to 400 mcs were less than 1 db with a phase error of 2 degrees. At 450 mcs the errors were 3 db and 10 degrees, respectively. Also covered is the use of such a device for i-f time delay steering of wideband array antennas. Problems encountered in properly terminating wideband delay lines and component selection and layout are discussed.
- Electrical and Electronic Equipment