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Current-mode class-D power amplifiers for high-efficiency RF applications

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3 Author(s)
Kobayashi, H. ; Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA ; Hinrichs, J.M. ; Asbeck, P.M.

We show that current-mode class-D (CMCD) power amplifiers can achieve high efficiency at RF frequencies. In contrast with conventional voltage-mode class-D amplifiers, the CMCD features "zero voltage switching," which eliminates the output capacitance discharge loss. Experimental CMCD amplifiers with 76.3% power-added efficiency (PAE) at 290-mW output and 71.3% PAE at 870-mW output are demonstrated using GaAs FETs at 900 MHz

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:49 ,  Issue: 12 )