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Depends on the configuration. You might have push-pull, or you might have 2 single-ended stages in parallel. There are differences in configuration between the two and in their respective spectral outputs, and a good description of parallel stages can be found in section 3.4.2 on page 31 in this paper: http://www.ieee.li/pdf/essay/rf_power_amplifier_fundamentals.pdf. I'll quote here (minus the figures):

As shown in section 3.4, a main difference is in the phase differences, and there is also hybrid coupling as an option:

[QUOTE="eagle1911, post: 314524, member: 17129"] Depends on the configuration. You might have push-pull, or you might have 2 single-ended stages in parallel. There are differences in configuration between the two and in their respective spectral outputs, and a good description of parallel stages can be found in section 3.4.2 on page 31 in this paper: [url]http://www.ieee.li/pdf/essay/rf_power_amplifier_fundamentals.pdf[/url]. I'll quote here (minus the figures): As shown in section 3.4, a main difference is in the phase differences, and there is also hybrid coupling as an option: [/QUOTE]

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