| 摘要 |
The present invention, generally speaking, provides for the effective use of dynamic bias control in a switch-mode RF amplifier to achieve an output signal having wide dynamic range. In one aspect, a method is provided of amplifying an RF signal to produce a variable output signal using an amplifier including a final amplification stage having a control terminal. The method includes: applying to the control terminal of the final amplication stage a drive signal and a bias signal; and varying the bias signal as a function of a desired output power of the variable output signal. The drive signal and together cause the final amplification stage to be driven repeatedly between two states, a hard-on state and a hard-off state, without operating in a linear operating region for an appreciable percentage of time, and the final amplification stage is controlled without continuous or frequent measurement and feedback adjustment of the variable output signal. |
