| 摘要 |
An efficient asymmetric push-pull amplifier for an envelope modulator because the positive peaks of the AC component of an envelope signal in an LTE or DVT-T2 system are greater than the negative peaks (figure 8), the efficiency of a push-pull amplifier for the AC part of an envelope modulator (306, figure 7) may be improved by asymmetry in the turns of the input transformer. Inequality of the turns B and C allows both the transistors Q1 and Q2 to saturate at the same given input AC peak-to-peak amplitude despite the asymmetric input signal at terminal 112. The ratio of the turns D and E in the output transformer is the same as that between B and C. The input and output transformers may both be transmission-line transformers.
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