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This article presents a quadrature switched/floated capacitor power amplifier (SFCPA) with deep back-off efficiency enhancement. The SFCPA is introduced to decrease the dynamic power consumption at power back-off (PBO), which could improve the system efficiency (SE). The reconfigurable self-coupling canceling transformer (RSCCT) with enhanced tuning range of turn ratio is used to achieve impedance boosting for further improved efficiency at deep PBO. Based on the proposed SFCPA, a watt-level quadrature digital power amplifier (DPA) with IQ cell sharing, hybrid Doherty, and impedance boosting is proposed for deep PBO efficiency enhancement. Implemented in 40-nm CMOS, the proposed DPA with 1.2-/2.4-V supply achieves 30.3-dBm saturated output power (<inline-formula> <tex-math notation="LaTeX">$P_{\mathrm{ out}}$ </tex-math></inline-formula>) with 36.6&#x0025;/32.9&#x0025;/29.1&#x0025;/23.7&#x0025;/18.6&#x0025;/13.2&#x0025; SE for 0-/3-/6-/9-/12-/15-dB PBOs at 2.4 GHz. For 60-MHz 256-QAM modulation signal, it delivers 23.32-dBm average output power (<inline-formula> <tex-math notation="LaTeX">$P_{\mathrm{ avg}}$ </tex-math></inline-formula>) with an error vector magnitude (EVM) of &#x2212;31.9 dB and an average drain efficiency (DE) of 30.7&#x0025;. For 40-MHz 1024-QAM signal, it shows 20.44-dBm <inline-formula> <tex-math notation="LaTeX">$P_{\mathrm{ avg}}$ </tex-math></inline-formula> with an EVM of &#x2212;35.9 dB and an average DE of 22.6&#x0025;.

Quadrature Switched/Floated Capacitor Power Amplifier With Reconfigurable Self-Coupling Canceling Transformer for Deep Back-Off Efficiency Enhancement