| 摘要 |
A power amplification circuit includes a power amplifier, an RF detector, an error amplifier, a saturation detector, and an offset circuit. The power amplifier provides an amplified signal based on an input signal and a gain control signal. The RF detector provides a detection signal indicative of a logarithm of the power of the amplified signal. The error amplifier provides the gain control signal based on an amplification control signal and the detection signal. The saturation detector provides a saturation signal in response to the gain control signal differing from a reference signal by less than a first predetermined voltage. The offset circuit decreases a voltage level of the amplification control signal by up to a second predetermined voltage in response to the saturation signal and the amplification control signal differing from the detection signal by less than the second predetermined voltage. |
