Design and stability test of a 2-40 GHz frequency doubler with active balun

An ultra-broadband PHEMT MMIC frequency doubler is designed. It comprises a FET active balun stage and a push-pull doubler in common-source configuration. Due to the purely lumped-element concept, the required chip area is very low. Using broadband compensation and matching networks, a nearly flat o...

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Bibliographic Details
Main Authors: van Raay, F., Kompa, G.
Format: Conference Proceeding
Language:English
Subjects:
Circuit simulation
Circuit stability
FETs
Frequency
Impedance matching
MMICs
Performance loss
PHEMTs
Power generation
Testing
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Description
Summary:An ultra-broadband PHEMT MMIC frequency doubler is designed. It comprises a FET active balun stage and a push-pull doubler in common-source configuration. Due to the purely lumped-element concept, the required chip area is very low. Using broadband compensation and matching networks, a nearly flat output power performance up to a limit of 2/3 f/sub T/ with acceptable conversion loss is predicted in circuit simulations and confirmed with broadband waveform measurements. The stability of the entire circuit is investigated including hidden instabilities and arbitrary passive input and output load conditions based on a direct stability circle calculation.
ISSN:0149-645X
2576-7216
DOI:10.1109/MWSYM.2000.862276