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Superconductive digital instantaneous frequency measurement subsystem

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6 Author(s)
Guo-chun Liang ; Conductus Inc., Sunnyvale, CA, USA ; Chien-Fu Shih ; Withers, R.S. ; Cole, B.F.
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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

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:41 ,  Issue: 12 )