Title :
Ultimate theoretic performance of microwave FET amplifiers with internal feedback
Author :
Carlin, Herbert J. ; Civalleri, Pier P.
Author_Institution :
Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA
Abstract :
It is proved, by introducing weighting functions, that the problem of broadband matching an arbitrary linear two-port with input and output lossless equalizers (resistive terminations) is equivalent to two passive load single-matching problems. The technique is applied to the problem of determining the maximum of an ideal rectangular gain function for an FET feedback amplifier. For finite feedback the ideal input equalized gain is exact, whereas the output least upper bound is approximate. The results, in effect, provide a figure of merit for a given FET which is a useful yardstick against which practical designs can be evaluated. Some numerical results are presented
Keywords :
feedback; field effect transistor circuits; impedance matching; microwave amplifiers; semiconductor device models; solid-state microwave circuits; FET feedback amplifier; arbitrary linear two-port; broadband matching; figure of merit; finite feedback; ideal input equalized gain; lossless equalizers; microwave FET amplifiers with internal feedback; numerical results; passive load single-matching problems; resistive terminations; ultimate theoretic performance; upper bound; weighting functions; Broadband amplifiers; Equalizers; Equivalent circuits; Feedback; Frequency; Microwave FETs; Microwave amplifiers; Noise reduction; Performance gain; Reflectivity;
Conference_Titel :
Circuits and Systems, 1989., Proceedings of the 32nd Midwest Symposium on
Conference_Location :
Champaign, IL
DOI :
10.1109/MWSCAS.1989.102028
