Title :
Neutralized differential amplifiers using mixed-mode S-parameters
Author :
Stengel, B. ; Thompson, B.
Author_Institution :
Motorola Labs and Motorola WITC, Plantation, FL, USA
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;
Conference_Titel :
Microwave Symposium Digest, 2003 IEEE MTT-S International
Conference_Location :
Philadelphia, PA, USA
Print_ISBN :
0-7803-7695-1
DOI :
10.1109/MWSYM.2003.1211068
