论文信息 - Neutralized differential amplifiers using mixed-mode S-parameters

Neutralized differential amplifiers using mixed-mode S-parameters

Distributed amplifiers offer very broadband operation, with the promise of a single all-band wireless solution. However, there are a number of distributed amplifier specific issues that have blocked practical implementation in a portable product. One of these is potential instability exacerbated by 20:1 antenna load impedance variation over a very broad frequency range of interest. This paper provides a neutralized differential amplifier implementation supported by mixed-mode S-parameters technology that offers a broadband stability solution for distributed amplifier application. Measurement results of a single section differential amplifier are included using Motorola's CDR1 BiCMOS technology.

B. Stengel | B. Thompson

[1] R. Stengel,et al. Accuracy estimation of mixed-mode scattering parameter measurements , 1999 .

[2] A. Platzker,et al. A rigorous yet simple method for determining stability of linear N-port networks [and MMIC application] , 1993, 15th Annual GaAs IC Symposium.

[3] W.R. Hewlett,et al. Distributed Amplification , 1948, Proceedings of the IRE.

[4] W. Eisenstadt,et al. Combined differential and common-mode scattering parameters: theory and simulation , 1995 .

[5] A. Platzker,et al. Rigorous determination of the stability of linear n-node circuits from network determinants and the appropriate role of the stability factor K of their reduced two-ports , 1994, Third International Workshop on Integrated Nonlinear Microwave and Millimeterwave Circuits.

[6] Lei Zhao,et al. A 6 watt LDMOS broadband high efficiency distributed power amplifier fabricated using LTCC technology , 2002, 2002 IEEE MTT-S International Microwave Symposium Digest (Cat. No.02CH37278).

[7] W. R. Eisenstadt,et al. Pure-mode network analyzer for on-wafer measurements of mixed-mode S-parameters of differential circuits , 1997 .