Title :
An X-band hybrid MIC feedforward amplifier for low residual noise operation
Author :
Sokolov, Vladimir ; Kruchowski, James N. ; Vickberg, Mark E. ; Buhrow, Benjamin ; Schuster, Steven ; Bublitz, James ; Gilbert, Barry K. ; Daniel, Erik S.
Author_Institution :
Mayo Clinic, Rochester, MN, USA
Abstract :
A 10 GHz, 15 dB gain feedforward amplifier (FFA) is described whose design is primarily aimed at reducing residual phase noise. The two-module hybrid MIC construction incorporates GaAs MMICs and microstrip thin-film interconnects on alumina. For loop balance electronic gain control is achieved using dual gate distributed amplifiers, while phase control is accomplished with mechanical phase shifters and delay lines. Measurements of near carrier noise are made from 1 Hz to 6.4 MHz. In the flicker region the 1 Hz intercept is -110 dBc/Hz, with an approximate corner frequency around 30 KHz at -160 dBc/Hz.
Keywords :
III-V semiconductors; MMIC amplifiers; distributed amplifiers; feedforward amplifiers; gain control; gallium arsenide; integrated circuit design; integrated circuit interconnections; integrated circuit noise; phase control; phase noise; phase shifters; 0.000001 to 6.4 MHz; 10 GHz; 15 dB; GaAs; MMIC feedforward amplifiers; X-band hybrid MIC feedforward amplifier; delay lines; dual gate distributed amplifiers; hybrid integrated circuits; loop balance electronic gain control; low residual noise operation; mechanical phase shifters; microstrip thin-film interconnects; near carrier noise; phase control; residual phase noise reduction; two-module hybrid MIC construction; Distributed amplifiers; Gain control; Gallium arsenide; Low-noise amplifiers; MMICs; Microstrip; Microwave integrated circuits; Operational amplifiers; Phase noise; Transistors;
Conference_Titel :
Microwave Symposium Digest, 2005 IEEE MTT-S International
Print_ISBN :
0-7803-8845-3
DOI :
10.1109/MWSYM.2005.1517146
