Title :
A 100-element HBT grid amplifier
Author :
Kim, Marn-Go ; Sovero, E.A. ; Hacker, J.B. ; De Lisio, M.P. ; Chiao, J.-C. ; Li, Si-Jia ; Gagnon, D.R. ; Rosenberg, J.J. ; Rutledge, D.B.
Author_Institution :
Div. of Eng. & Appl. Sci., California Inst. of Technol., Pasadena, CA, USA
Abstract :
A 100-element 10-GHz grid amplifier has been developed. The active devices in the grid are chips with heterojunction bipolar transistor (HBT) differential pairs that include a resistive network to provide self-bias to the base. The planar metal grid structure was empirically designed to provide effective coupling between the HBTs and free space. Two independent measurements, one with focusing lenses, the other without, were used to measure the gain of the grid. In each case the peak gain of the grid was 10 dB at 10 GHz with a 3-dB bandwidth of 1 GHz. The input and output matches are better than 15 dB at 10 GHz. The maximum output power is 450 mW, and the minimum noise figure is 7 dB. Tests show that the grid is quite tolerant of failures-the output power dropped by only 1 dB when 10% of the inputs were detuned. The device amplifies beams with incidence angles up to 30 degrees with less than a 3-dB drop in power.<>
Keywords :
MMIC; antenna accessories; bipolar integrated circuits; differential amplifiers; microwave amplifiers; waveguide components; 1 GHz; 10 GHz; 10 dB; 100-element HBT grid amplifier; 450 mW; 7 dB; HBT differential pairs; active devices; chips; effective coupling; far field horn source; focusing lenses; gain; heterojunction bipolar transistor; incidence angles; input matches; noise figure; output matches; output power; planar metal grid structure; power combining; resistive network; self-bias; Computer hacking; Gain measurement; Heterojunction bipolar transistors; Impedance matching; Polarization; Power generation; Resistors; Semiconductor device measurement; Testing; Weapons;
Conference_Titel :
Microwave Symposium Digest, 1993., IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-1209-0
DOI :
10.1109/MWSYM.1993.276863
