A 2.3-to-3.2GHz Class-G Impedance-Modulation Power Oscillator with 10dBm Peak $P_{\text{out}}$ and 39%/37%/33%/30% Efficiency at 0/3/6/9dB PBOs

In this paper, a Class-G impedance-modulation power oscillator is proposed to enhance the efficiencies at multiple PBOs. With the switch-combined reconfigurable matching-resonator, the output matching is optimized along with the tuning of oscillation frequency. Meanwhile, the digitally controlled tail resistor array is used to continuous tune the output power. The proposed power oscillator is fabricated in a 40-nm CMOS technology. Measurements exhibit a 33% tuning range from 2.3 to 3.2GHz. The peak output power is 10dBm while the efficiencies at 0/3/6/9dB PBOs are 39%, 37%, 33%, and 30%, respectively. The 1MHz-offset phase noise is −131.5 to −127.2dBc/Hz over the operation frequency.