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In this paper, the design and measurement results of a 1.8 GHz to 2.3 GHz broadband Doherty power amplifier (DPA) are reported. A modified load modulation network is designed to minimize impedance transformation ratio over the entire dynamic range for the purpose of extending the operating bandwidth. Experimental results show that the drain efficiency of the proposed DPA maintains above 50% and 63%...
This article presents a modified GaN Doherty power amplifier (PA) for 100 MHz long‐term evolution (LTE)‐advanced application at 2.5 GHz. To improve load modulation and consistency of the output power and efficiency in the operation bandwidth, a method was proposed by choosing optimal load impedances in Class C mode, properly increased gate bias voltage and optimized input matching network for the...
This paper presents the methods to improve load modulation in Doherty along with two modified GaN Doherty power amplifiers (PAs) with high efficiency and linearity at large back-off power for 100 MHz LTE-advanced application. To improve load modulation, the peaking amplifier is designed to achieve similar output current with that of the carrier amplifier by choosing optimal load impedances in class...
This paper presents a linearized Doherty power amplifier (PA) operating over 100 MHz instantaneous bandwidth at 3.5 GHz. To maintain high efficiency at large back-off output power and achieve improved load modulation, the Doherty PA is designed by using unequal sized GaN devices. An uneven power divider is also utilized to deliver more input power to the peaking amplifier. Experimental results show...
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