IEEE Transactions on Microwave Theory and Techniques · 1969 · 82 citations · 10 references
EngineeringElectrical EngineeringMicroelectronicsMicrowave EngineeringSemiconductor DevicesActive FiltersHigh-frequency Semiconductor DevicesMicrowave FiltersMicrowave Integrated CircuitsMicrowave Semiconductor DevicesRadio-frequency Integrated CircuitsBand-pass Active FiltersBand-pass FiltersFiltersInductorsInsertion LossNoise FigureNoise Figure AnalysisNonlinear Distortion
The authors present a method that employs transistors as high‑Q inductors for microwave‑frequency band‑pass filtering. They fabricated and tested several band‑pass filters using the inductive transistor circuit, and performed noise‑figure and nonlinear‑distortion analyses with supporting experimental data. The resulting filters exhibit stable operation with unity insertion loss at UHF, maintain performance during temperature cycling, and demonstrate suitability for small‑signal filtering and multiplexing applications.
A technique is described for using transistors directly as high-Q inductors at microwave frequencies. Several experimental band-pass filters have been built and tested to verify usefulness of the inductive transistor circuit. Stable filters with unity insertion loss have been realized at UHF. Observations made during temperature cycling show that environmental stabilization can also be achieved. Analysis has been made of noise figure and nonlinear distortion, and supporting experimental data are provided. The inductive transistor circuit is expected to be practical for a variety of small-signal filtering and multiplexing applications.
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