Optimised Doherty power amplifier with auxiliary peaking cell. Issue 18 (1st August 2014)

• Record Type: Journal Article
• Authors: Lee, Juyeon; Son, Junghwan; Kim, Bumman
• Is Part Of: Electronics letters. Volume 50:Issue 18(2014)
• Page Start: 1299
• Page End: 1301
• Publication Date: 2014-08-01
• Subjects: power amplifiers -- differentiating circuits; Doherty power amplifier -- auxiliary peaking cell -- peak‐to‐average power ratio -- PAPR -- Doherty operation -- carrier amplifier -- load modulation -- peak power region -- auxiliary drive cell -- peaking amplifier -- output power reduction problem -- power‐added efficiency -- PAE; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2014.2214
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : The Doherty power amplifier has the most attractive architecture to improve the efficiency for amplifying a signal with a high peak‐to‐average power ratio. However, the ideal Doherty operation is difficult to be achieved because the g m of the peaking amplifier should be two times larger than that of the carrier amplifier. The g m mismatch between the carrier and peaking amplifiers hinders the proper load modulation at the peak power region. The Doherty power amplifier with an auxiliary drive cell for the peaking amplifier is introduced to solve the problem. The auxiliary peaking cell drives the main peaking amplifier with higher input power, solving the gain and output power reduction problem. Experimental results show that the proposed Doherty power amplifier can enhance gain, output power and power‐added efficiency.