Pakasiri, Chatrpol

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Pakasiri, Chatrpol
Alternative Name
Pakasiri, Charpol
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Email
chatrpol.pa@kmitl.ac.th

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    Item type:Publication,
    Modified Class-F power amplifier design with fundamental frequency output impedance load
    (2021-04-01)
    Pakasiri, Chatrpol
    ;
    Manasummakij, Prateep
    ;
    Wang, Sen
    A modified Class-F power amplifier with medium output power at 433 MHz was designed, simulated and implemented in this paper. The design process used a load condition of 1) output impedance of the amplifier at the fundamental frequency, 2) short-circuit loads at the even harmonics and 3) open-circuit loads at the odd harmonics. By biasing the circuit to be a typical Class-F, the circuit yielded moderate efficiency as the load condition was different from the optimum one. By strongly biasing the circuit toward that of Class-A, the load condition approached the optimum, but the circuit still yielded moderate efficiency due to the low efficiency nature of a Class-A amplifier. By proper choice of the operating point in Class-AB, a prototype circuit, with 9 dBm input power, yielded a maximum PAE of 68.5% with output power 21.8 dBm. Furthermore, at 11 dBm input power, the prototype yielded a better PAE 79.6% with 23.2 dBm output power. Our design procedure did not need expensive load-pull equipment.
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    Item type:Publication,
    Maximized Output Power Design of Switch-Mode Power Amplifier with Thevenin Impedance
    (2020-06-01)
    Manasummakij, Prateep
    ;
    Pakasiri, Chatrpol
    This paper presents a class-E power amplifier circuit designed using Thevenin impedance. The aim of the method is to maximize the output power of the circuit. The measured results showed that the proposed method yielded output power of 24.33 dBm comparing to 24.99 dBm of the simulated one.