Stability of grid amplifiers

Author

Liu, Cheh-Ming ; Lisio, Michael P De ; Moussessian, Alina ; Rutledge, David B.

Author_Institution

Sci. Center, Rockwell Int. Corp., Thousand Oaks, CA, USA

Volume

46

Issue

6

fYear

1998

fDate

6/1/1998 12:00:00 AM

Firstpage

769

Lastpage

774

Abstract

We present a stability model for quasi-optical grid amplifiers. This model is useful for predicting and suppressing the common-mode oscillations that often occur in amplifier grids. Three stabilization techniques will be discussed. The first technique uses a capacitor to stabilize the grid. The second approach employs resistance to suppress the oscillations. The final technique stabilizes the grid by reducing the on-chip common-mode resistance, allowing greatly increased amplifier efficiencies. Experimental evidence will be presented to confirm the validity of our stability model.

Keywords

circuit stability; microwave amplifiers; microwave integrated circuits; amplifier efficiencies; capacitive stabilization; common-mode oscillations; microwave ICs; on-chip common-mode resistance; quasi-optical grid amplifiers; resistive stabilization; stability model; Dielectric substrates; Heterojunction bipolar transistors; Laboratories; Microwave transistors; Oscillators; PHEMTs; Polarization; Power system modeling; Radiofrequency amplifiers; Stability;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.681199

Filename

681199