Power control apparatus for improving harmonic wave, and power amplifier and device

A power control apparatus for improving harmonic waves, comprising:

• a voltage conversion circuit configured to convert a power control voltage, to output a target control voltage;
• and
• a power control circuit connected to the voltage conversion circuit, and configured to perform power control on a received input signal according to the target control voltage, to obtain a target output signal;
• wherein the voltage conversion circuit comprises:
• a first conversion sub-circuit configured to convert the power control voltage into a power control current;
• a first current sub-circuit connected to the first conversion sub-circuit, and configured to generate a first current according to the power control current;
• a second current sub-circuit connected to the first conversion sub-circuit, and configured to generate a second current according to the power control current;
• and
• a second conversion sub-circuit connected to the first current sub-circuit and the second current sub-circuit respectively, and configured to superimpose the first current and the second current and convert a superimposed current into the target control voltage;
• wherein the first conversion sub-circuit comprises an operational amplifier, a first field effect transistor (FET), a first resistor and a capacitor,
• an inverting input end of the operational amplifier is connected to the power control voltage, an output end of the operational amplifier is connected to a gate of the first FET and one end of the capacitor respectively, the other end of the capacitor is connected to a non-inverting input end of the operational amplifier, a drain of the first FET and the first resistor respectively, and the drain of the first FET is grounded through the first resistor;
• wherein the second current sub-circuit comprises a second FET, a first FET group, a second FET group and an adjustable current source, to thereby facilitate power controlling and, through cooperation of the voltage conversion circuit and the power control circuit, reducing magnitudes of the harmonic waves generated by a power amplifier.