Title :
Superconductive digital instantaneous frequency measurement subsystem
Author :
Guo-chun Liang ; Chien-Fu Shih ; Withers, Richard S. ; Cole, B.F. ; Johansson, Morgan E. ; Suppan, Larry P., Jr.
Author_Institution :
Conductus Inc., Sunnyvale, CA, USA
fDate :
12/1/1993 12:00:00 AM
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 ±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 :
cryogenics; digital instrumentation; discriminators; frequency measurement; high-temperature superconductors; microwave measurement; superconducting microwave devices; 4 GHz; 500 MHz; GaAs limiting amplifier; GaAs mixers; cryogenic section; digital instantaneous frequency measurement subsystem; discriminator modules; frequency quantization boundaries; high-temperature-superconductive subsystem; power dividers; silicon postprocessor; single-tone CW input; superconductive delay lines; unknown signals; Bandwidth; Cryogenics; Delay lines; Frequency measurement; Gallium arsenide; Power dividers; Quantization; Signal resolution; Silicon; Superconductivity;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
