{"title":"Q-band high isolation GaAs HEMT switches","authors":"D. Ingram, K. Cha, K. Hubbard, R. Lai","doi":"10.1109/GAAS.1996.567891","DOIUrl":"https://doi.org/10.1109/GAAS.1996.567891","url":null,"abstract":"In this paper, we present on-wafer measured results of Q-band GaAs HEMT switches. This work benchmarks the state-of-the-art performance of a SPDT switch with 1.6 dB insertion loss and 50 dB isolation at 44 GHz; a SPQT switch with 3 dB insertion loss and 42 dB isolation at 44 GHz. The SPDT switch has isolation of 30-50 dB over a 41-49 GHz bandwidth. The SPQT switch has isolation of 30-48 dB over a 42-47 GHz bandwidth. This is a 20 dB improvement in isolation over reported Q-band FET switches.","PeriodicalId":365997,"journal":{"name":"GaAs IC Symposium IEEE Gallium Arsenide Integrated Circuit Symposium. 18th Annual Technical Digest 1996","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129475509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Wang, M. Cole, L. Hou, P. Chu, C.D. Chang, T. Midford, T. Cisco
{"title":"A 55% efficiency 5 W PHEMT X-band MMIC high power amplifier","authors":"R. Wang, M. Cole, L. Hou, P. Chu, C.D. Chang, T. Midford, T. Cisco","doi":"10.1109/GAAS.1996.567818","DOIUrl":"https://doi.org/10.1109/GAAS.1996.567818","url":null,"abstract":"We have developed a highly efficient two stage X-band MMIC high power amplifier. Based on an optimized PHEMT device structure and a novel design approach, the amplifier demonstrated an average power added efficiency of 55% and an output power of 5 watts. A peak efficiency of 60% at near 8.0 GHz was obtained. The average drain current is 1.4 A at 7.0 V drain voltage. This is the highest reported efficiency for a broad-band, high power amplifier at X-band frequencies.","PeriodicalId":365997,"journal":{"name":"GaAs IC Symposium IEEE Gallium Arsenide Integrated Circuit Symposium. 18th Annual Technical Digest 1996","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125786233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Kobayashi, L. Tran, T. Block, A. Oki, D. Streit
{"title":"Low dc power high-gain bandwidth product InAlAs/InGaAs-InP HBT direct-coupled amplifiers","authors":"K. Kobayashi, L. Tran, T. Block, A. Oki, D. Streit","doi":"10.1109/GAAS.1996.567829","DOIUrl":"https://doi.org/10.1109/GAAS.1996.567829","url":null,"abstract":"Here we report on a low dc power and voltage operated InAlAs/InGaAs-InP HBT direct-coupled amplifier which achieves a record Gain-Bandwidth-Product per dc power figure-of-merit (GBP/P/sub dc/) of 3.66 GHz/mW. It is a 44% improvement over previous state-of-the-art HBT and BJT amplifiers based on InP, GaAs, or Si-Ge materials. The amplifier consists of a 2-stage direct-coupled design based on low bandgap InAlAs/InGaAs HBTs with f/sub T/'s and f/sub max/'s of 80 GHz and 200 GHz, respectively. Self-biased from a 3 V supply, the amplifier obtains 15.1 dB gain with a 22 GHz bandwidth while consuming only 34.2 mW of dc power. Biased at 5 V and 23.4 mA, a gain of 19.3 dB and a bandwidth of 25 GHz was achieved with a corresponding open circuit transimpedance of 59.5 dB-/spl Omega/ (944 /spl Omega/) and 25 GHz. Effective 50 /spl Omega/ output loaded transimpedance is 52.7 dB-/spl Omega/ with a GHz bandwidth. The effective transimpedance bandwidth-product is 10.3 THz-/spl Omega/ and is 21% higher than the previous record of 8.5 THz-/spl Omega/ for an AlGaAs/GaAs HBT which consumes more than twice the dc power. This work illustrates the high gain-bandwidth and speed performance which InAlAs/InGaAs HBTs can achieve with very little dc power and suggests great potential for future high data rate IC applications such as optical-electronic communications.","PeriodicalId":365997,"journal":{"name":"GaAs IC Symposium IEEE Gallium Arsenide Integrated Circuit Symposium. 18th Annual Technical Digest 1996","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125789408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Murakami, S. Tanaka, Y. Amamiya, H. Shimawaki, N. Goto, K. Honjo, Y. Ishida, Y. Saitoh, M. Yajima, Y. Hisada
{"title":"A 3.6-W 26 GHz-band AlGaAs/GaAs HBT power amplifier","authors":"S. Murakami, S. Tanaka, Y. Amamiya, H. Shimawaki, N. Goto, K. Honjo, Y. Ishida, Y. Saitoh, M. Yajima, Y. Hisada","doi":"10.1109/GAAS.1996.567751","DOIUrl":"https://doi.org/10.1109/GAAS.1996.567751","url":null,"abstract":"A 3.6-watt 26-GHz band AlGaAs/GaAs heterojunction bipolar transistor (HBT) power amplifier is described. The amplifier is composed of two common-base (CB) HBT chips, and achieves a output power of 3.63 W (35.6 dBm), power-added efficiency (PAE) of 21.2% and associated gain of 6.2 dB with a 1-dB bandwidth between 25.5 and 26.5 GHz. As far as we know, the output power obtained in this work is more than twice that obtained in other works in these frequency bands.","PeriodicalId":365997,"journal":{"name":"GaAs IC Symposium IEEE Gallium Arsenide Integrated Circuit Symposium. 18th Annual Technical Digest 1996","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115555769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}