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A linearity enhancement technique to a CMOS triple cascode push-pull power amplifier (PA) by second harmonic feedback has been proposed. The Second harmonic feedback is optimized to improve linearity based on the concept that the linearity is depend on the second harmonic feedback amplitude and phase. In order to feed second harmonics back to the push-pull PAs, we adopt a balun with a branching filter...
This paper presents the improvement of efficiency of power amplifiers by 2nd and 3rd harmonics injection with a newly developed triplexer. An L-band 10W GaN HEMT PA with input and output triplexers have been fabricated. The dependence of injection power level on the improvement of efficiency from both input and output injection is studied. The 2nd harmonics injection delivers higher efficiency improvement...
A novel linearization technique to a CMOS push-pull power amplifier (PA) by second harmonic injection has been proposed. In order to inject second harmonics to the PAs, a new balun with a branching filter has been proposed and fabricated by using multi-layered organic substrates. The PA was fabricated in 0.18-μm CMOS process and was implemented on the balun by flip-chip connection. Because of the...
A novel linearization technique to a CMOS push-pull power amplifier (PA) by second harmonic injection has been proposed. In order to inject second harmonics to the PAs, a new balun with a branching filter has been proposed and fabricated by using multi-layered organic substrates. The PA was fabricated in 0.18-µm CMOS process and was implemented on the balun by flip-chip connection. Because of the...
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