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A differential Common-Gate Class-E Power Amplifier with positive-negative feedback

In this work, the design of a CMOS Class E Power Amplifier (PA), for low-power and low-cost biomedical devices is presented in a standard 0.13µm CMOS technology. The PA employs Class E topology to exploit its soft-switching property for high efficiency. A differential Common-Gate (CG) structure is employed to achieve a highly symmetrical topology, there by reducing the significant distortion in the output signal of the conventional single-ended Class E PA. The CG switching scheme increases the maximum allowable supply voltage. In order to achieve a high power gain with a low NF, a positive-negative feedback technique is proposed. By employing these techniques, the PA can deliver 22dBm output power to 50Ω load at 402MHz with 68% Power-added efficiency (PAE) from a 1.2V supply without stressing the active devices.