Title :
Superconductive digital instantaneous frequency-measurement subsystem
Author :
Liang, G.-C. ; Shih, C.F. ; Withers, R.S. ; Cole, B.F. ; Johansson, Morgan E. ; Suppan, L.P.
Author_Institution :
Conductus Inc., Sunnyvale, CA, USA
Abstract :
A 5-b high-temperature-superconductive digital instantaneous frequency-measurement (DIFM) subsystem has been constructed for the determination of the frequency of unknown signals over a 500-MHz bandwidth, centered on 4 GHz, with a resolution of +or-7.8 MHz. The subsystem contains a cryogenic section with five discriminator modules using superconductive delay lines, GaAs mixers, and power dividers. The subsystem also has a room-temperature GaAs limiting amplifier and a silicon postprocessor. With a single-tone CW (continuous-wave) input between-40 dBm and +10 dBm, the frequency quantization boundaries of the subsystem are, on average, 3.1 MHz from their design values.<>
Keywords :
discriminators; frequency measurement; high-temperature superconductors; microwave measurement; 4 GHz; 500 MHz; HTSC; cryogenic section; digital instantaneous frequency-measurement subsystem; discriminator modules; frequency quantization boundaries; limiting amplifier; mixers; power dividers; silicon postprocessor; superconductive delay lines; Bandwidth; Cryogenics; Delay lines; Frequency; Gallium arsenide; Power dividers; Quantization; Signal resolution; Silicon; Superconductivity;
Conference_Titel :
Microwave Symposium Digest, 1993., IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-1209-0
DOI :
10.1109/MWSYM.1993.276733
