A Single-Ended Modified Class-E PA With HD2 Rejection for Low-Power RF Applications

Silva-Pereira, MarcoCaldinhas Vaz, J.2025-02-102025-02-102018-01M. Silva-Pereira and J. Caldinhas Vaz, "A Single-Ended Modified Class-E PA With HD2 Rejection for Low-Power RF Applications," in IEEE Solid-State Circuits Letters, vol. 1, no. 1, pp. 22-25, Jan. 2018.http://hdl.handle.net/10400.26/54331This letter presents a fully integrated single-ended power amplifier for ultralow-power applications. The single-ended configuration is possible due to a choke-inductor less output network capable of rejecting the second-harmonic emission. A switching duty-ratio lower than 50% avoids the impedance transformation output network traditionally required for proper class-E operation. At 2.45 GHz, the PA (including the driver) delivers 1.4 dBm to a 50 Ω load and achieves an overall efficiency of 51% while complying with the spurious emission regulation. The prototype was fabricated in 0.13 μm CMOS.engClass-ECMOSpower amplifierradiofrequencyultralow-power (ULP)A Single-Ended Modified Class-E PA With HD2 Rejection for Low-Power RF Applicationsjournal article10.1109/LSSC.2018.2803450