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  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C   No.4   pp.765-767
Publication Date: 2012/04/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.765
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Electronic Circuits
Keyword: 
CMOS,  Class-E power amplifiers,  common mode,  stability,  closed-loop transfer function,  pole,  zero,  right half plane,  

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Summary: 
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.