| 摘要 |
A switching stage comprises first and second switching paths (fig 4, 69,82) each having at least one switching element for selectively connecting an input of the switching stage to an output. A signal is selectively routed from the input of the switching stage to its output via the switching paths in dependence on the current of the signal to be routed. Each switching path can include an inductive element that is connected to higher or lower voltage levels according to the current. One path can be configured to handle a smaller current, and have a smaller size switching element, than the other. One path can include switch arrays (fig 4, 34,36) connecting the input to the output via intermediate lines, each having a capacitor, enabling different voltages to be generated and selected. The switching stage can provide an envelope tracking supply voltage to a radio frequency power amplifier. |
