Title :
Novel high gain and broadband GaAs MMIC distributed amplifiers with traveling-wave gain stages
Author :
Deng, Kuo-Liang ; Huang, Tian-Wei ; Wang, Huei
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
Using the concept of traveling-wave gain stages, novel GaAs MMIC distributed amplifiers are designed to achieve high-gain over several octaves of bandwidth. The cascaded single-stage distributed amplifiers (CSSDAs) are used as traveling-wave gain stages to improve the gain performance of conventional distributed amplifier (CDA). By selecting the low pass filter (LPF) topology for the CDA and CSSDA and tuning the gain shape of CDA and CSSDA, a wide-band performance of the broadband amplifier, called CDA-CSSDA-2 is obtained. The CDA-CSSDA-2 achieves 22 ± 1.5 dB small signal gain from 0.1 to 40 GHz with a chip size of 1.5 × 2 mm2. This distributed amplifier produces gain-bandwidth product (GBW) of 503 which is the highest among all GaAs based distributed amplifiers. The flat group delay of the proposed distributed amplifier also proves the feasibility of this methodology for digital optical communications and broadband pulse applications.
Keywords :
HEMT integrated circuits; III-V semiconductors; MMIC amplifiers; cascade networks; distributed amplifiers; field effect MIMIC; gallium arsenide; travelling wave amplifiers; wideband amplifiers; 0.1 to 40 GHz; 22 dB; GaAs; GaAs MMIC distributed amplifiers; PHEMT MMIC foundry process; broadband amplifier; broadband pulse applications; cascaded single-stage distributed amplifiers; digital optical communications; flat group delay; high-gain amplifiers; low pass filter topology; pseudomorphic HEMT; traveling-wave gain stages; wideband performance; Bandwidth; Broadband amplifiers; Delay; Distributed amplifiers; Gallium arsenide; Low pass filters; MMICs; Performance gain; Shape; Topology;
Conference_Titel :
Radio Frequency Integrated Circuits (RFIC) Symposium, 2003 IEEE
Print_ISBN :
0-7803-7694-3
DOI :
10.1109/RFIC.2003.1213954
