A new simultaneous noise and input power matching technique for monolithic LNA´s using cascode feedback

Author

Beom Kyu Ko ; Lee, Kwyro

Author_Institution

Samsung Electron. Co. Ltd., Kyungki-Do, South Korea

Volume

45

Issue

9

fYear

1997

fDate

9/1/1997 12:00:00 AM

Firstpage

1627

Lastpage

1629

Abstract

In this paper, a new simultaneous impedance-matching technique of Γ_opt (optimum noise-match source reflection coefficient) and G_max (maximum available power gain-match (MAPG) source reflection coefficient) using cascode feedback (CF) is proposed. A 1.57-GHz single-stage monolithic-microwave Integrated-circuit (MMIC) low-noise amplifier (LNA) designed with this technique has been fabricated using GaAs MESFET technology in order to verify the feasibility of this scheme. The measured response agrees well with the simulated performance. Extensive computer simulation shows that when silicon npn bipolar junction transistor (BJT) is used, this scheme enables us to make both Γ_opt and G_max points near to 50 Ω, in addition to the simultaneous noise and input power matching. In addition, it has all the advantages of negative feedback such as stability, wider bandwidth, and insensitivity against parameter variation

Keywords

III-V semiconductors; MESFET integrated circuits; MMIC amplifiers; circuit stability; feedback amplifiers; gallium arsenide; integrated circuit design; integrated circuit noise; 1.57 GHz; GaAs; MESFET technology; MMIC low-noise amplifier; available power gain-match; bandwidth; cascode feedback; input power matching technique; negative feedback; optimum noise-match source reflection coefficient; parameter variation insensitivity; source reflection coefficient; stability; Acoustic reflection; Computational modeling; Computer simulation; Feedback; Gallium arsenide; Impedance matching; Low-noise amplifiers; MESFETs; MMICs; Optimized production technology;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.622931

Filename

622931