Neutralized differential amplifiers using mixed-mode S-parameters

Author

Stengel, B. ; Thompson, B.

Author_Institution

Motorola Labs and Motorola WITC, Plantation, FL, USA

Volume

1

fYear

2003

Abstract

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.

Keywords

BiCMOS analogue integrated circuits; S-parameters; UHF amplifiers; UHF integrated circuits; circuit stability; differential amplifiers; wideband amplifiers; CDR1 BiCMOS technology; antenna load impedance variation; broadband operation; broadband stability; instability; mixed-mode S-parameters; neutralized differential amplifiers; portable product; Application software; Capacitance; Differential amplifiers; Distributed amplifiers; Equations; Frequency; Impedance; Loaded antennas; Measurement standards; Scattering parameters;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 2003 IEEE MTT-S International

Conference_Location

Philadelphia, PA, USA

ISSN

0149-645X

Print_ISBN

0-7803-7695-1

Type

conf

DOI

10.1109/MWSYM.2003.1211068

Filename

1211068