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Browse Journals & Magazines > Microwave Theory and Techniqu ...> Volume:56 Issue:6 Help

Bandwidth Potential of Cascode HBT-Based TWAs as a Function of Transistor { f} _{\max } /{ f} _{ T} Ratio

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4 Author(s)
Meliani, C. ; Ferdinand-Braun-Inst. fur Hochstfrequenztechnik, Berlin ; Rudolph, M. ; Doerner, R. ; Heinrich, W.

The bandwidth potential of cascode HBT-based broadband amplifiers following the traveling-wave amplifier (TWA) concept is studied. An approximate expression for the gain of the circuit is derived, which is based on the transistor small-signal model and the artificial transmission-line parameters. In this way, a relation between the HBT cutoff frequencies fT and fmax and the 3-dB cutoff frequency fc of the amplifier is obtained. This is very useful for assessing the gain-bandwidth potential of a given HBT technology for cascode-based TWAs. Applying these results, we study the potential of two technologies with different fmax / fT ratios, an InP technology with fmax / fT of 120 GHz/190 GHz, and a GaAs technology with fmax / fT of 170 GHz/36 GHz. The higher influence of /max (compared to ft) on fc is quantitatively demonstrated. TWAs in both technologies were realized and measured, and good agreement between measurement and theory is obtained.

Published in:
Microwave Theory and Techniques, IEEE Transactions on  (Volume:56 ,  Issue: 6 )

Date of Publication: June 2008

Page(s):
1331 - 1337
ISSN :
0018-9480
INSPEC Accession Number:
10074595
Digital Object Identifier :
10.1109/TMTT.2008.921747
Date of Current Version :
06 June 2008
Issue Date :
June 2008
Sponsored by :
IEEE Microwave Theory and Techniques Society

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