This paper presents a high efficiency Doherty power amplifier suitable for TV band applications. A\nclass AB power amplifier is firstly implemented using a commercial GaN HEMT from Cree Incorporation,\nachieving a high power-added-efficiency of 77.78% and a 40.593 dBm output power with\nan associated gain of 21.65 dB. The Doherty amplifier has then been designed following the previous\nclass AB scheme for the main amplifier and a class C scheme for the peak one. This amplifier\nattained a high power-added-efficiency of 81.94%, a 42.77 dBm output power, an associated gain\nof 21.32 dB, and an operating frequency bandwidth between 550 and 1000 MHz (58.06% fractional\nbandwidth) which made it suitable for TV band applications.
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