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A New Common-Mode Stabilization Method for a CMOS Cascode Class-E Power Amplifier with Driver Stage
Zhisheng LI Johan BAUWELINCK Guy TORFS Xin YIN Jan VANDEWEGE
IEICE TRANSACTIONS on Electronics
Publication Date: 2012/04/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Electronic Circuits
CMOS, Class-E power amplifiers, common mode, stability, closed-loop transfer function, pole, zero, right half plane,
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This paper presents a new common-mode stabilization method for a CMOS differential cascode Class-E power amplifier with LC-tank based driver stage. The stabilization method is based on the identification of the poles and zeros of the closed-loop transfer function at a critical node. By adding a series resistor at the common-gate node of the cascode transistor, the right-half-plane poles are moved to the left half plane, improving the common-mode stability. The simulation results show that the new method is an effective way to stabilize the PA.