Title :
A Monolithic HEMT-Amplifier with Feedback in Coplanar Waveguide Technology
Author :
Bischof, W. ; Ehrlinger, W. ; Berroth, M. ; Reinert, W.
Author_Institution :
ANT Nachrichtentechnik GmbH, GerberstraÃ\x9fe 33, D-7150 Backnang/FRG
Abstract :
A monolithic integrated wide-band amplifier is presented, which consists of two 0.3 ¿m HEMT-stages in GaAs/GaAlAs-Technology. The main signal path consists of a coplanar waveguide, which interfaces conveniently to the HEMT-cells. A feedback circuit with R, L and C connects gate and drain. To close the feedback loop small scale microstrip lines were combined with CPW /1, 2, 4/. Matching is done with a LC circuit at the gate and a combination of transmission line and capacitor at the drain. In addition there are some other passive elements for biasing, which reduce external components to a minimum. All element models were checked with measured data and placed into a CAD-library for easy use in the design process.
Keywords :
Broadband amplifiers; Capacitors; Coplanar waveguides; Distributed parameter circuits; Feedback circuits; Feedback loop; Gallium arsenide; Integrated circuit technology; Microstrip; Transmission line measurements;
Conference_Titel :
Microwave Conference, 1992. 22nd European
Conference_Location :
Helsinki, Finland
DOI :
10.1109/EUMA.1992.335808
