Title :
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
fDate :
6/1/1998 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
