| 摘要 |
<p>Generating a power supply output signal includes generating an intermediate supply signal Vsw dependant on a reference signal 112 that represents a desired output and generating plural adjustment signals 166,168 tracking the reference signal in dependence on the intermediate signal and the reference signal. Adjusted supply signals 174,176 can be summed to give a high output current capability, which can supply power to an RF amplifier (fig 2, 210) or each adjusted signal can supply power to an individual RF amplifier stage (fig 302,304). The intermediate supply can be generated by selecting one of plural supply voltages depending on the reference signal, and can be combined with the adjustment signals by respective transformers (fig 2, 202,204), whose secondary windings are connected to sum the adjusted signals. Using plural parallel correction amplifiers allows a higher power to be produced, at a higher frequency bandwidth, than would be produced by a single correction stage.</p> |
