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 0.13 mum 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 22 dBm output power to 50 Omega load at 402 MHz with 68% Power-added efficiency (PAE) from a 1.2 V supply without stressing the active devices.