![]() In radio transmitters, the PA is generally the main consumer of battery dc power. This means that an effective battery life solution is necessary. Modern portable two-way radios are required to operate over a large number of channels for a long period of time from a small size battery. Up to now, these harmonic and efficiency results are the highest obtained over a broad VHF frequency band, with a low supply voltage of 7.2 V. An efficiency of 70 percent and a second-harmonic suppression of –73 dBc across a wide bandwidth (135 to 175 MHz), at an operating power of 6.5 W, are demonstrated. A novel series L xC x, with a high-Q roll-off harmonic filter (elliptical type), provides high harmonic suppression while maintaining the class-E switching mode over a broad frequency band. The final PA stage uses a broadband class-E design, which combines a parallel-circuit load network with a reactance compensation technique. A three-stage power amplifier is used to provide high gain and output power as required for two-way radio applications. ![]() This article introduces a practical implementation to achieve high harmonic suppression in a broadband class-E amplifier design by combining a parallel-circuit load network with a reactance compensation technique. However, with broadband load networks, their harmonic performance degrades. ![]() ![]() Class-E power amplifiers (PA) offer high efficiency. ![]()
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