- Tytuł:
- High-Frequency Power Amplitude Modulators with Class-E Tuned Amplifiers
- Autorzy:
-
Modzelewski, J.
Mikołajewski, M. - Powiązania:
- https://bibliotekanauki.pl/articles/307948.pdf
- Data publikacji:
- 2008
- Wydawca:
- Instytut Łączności - Państwowy Instytut Badawczy
- Tematy:
-
high-efficiency amplitude modulators
non-ZVS operation
optimum operation
PSpice simulations
suboptimum operation - Opis:
- A high-frequency power amplifier used in a drain amplitude modulator must have linear dependence of output HF voltage Vo versus its supply voltage VDD. This condition essential for obtaining low-level envelope distortions is met by a theoretical class-E amplifier with a linear shunt capacitance of the switch. In this paper the influence of non-linear output capacitance of the transistor in the class-E amplifier on its Vo(VDD) characteristic is analyzed using PSPICE simulations of the amplifiers operating at frequencies 0.5 MHz, 5 MHz and 7 MHz. These simulations have proven that distortions of theVo(VDD) characteristic caused by non-linear output capacitance of the transistor are only slight for all analyzed amplifiers, even for the 7 MHz amplifier without the external (linear) shunt capacitance. In contrast, the decrease of power efficiency of the class-E amplifier resulting from this effect can be significant even by 40%
- Źródło:
-
Journal of Telecommunications and Information Technology; 2008, 4; 79-86
1509-4553
1899-8852 - Pojawia się w:
- Journal of Telecommunications and Information Technology
- Dostawca treści:
- Biblioteka Nauki
Artykuł