Radio frequency power amplifier and electronic system

A RF power amplifier, used for receiving and amplifying a RF input signal and accordingly outputting a RF output signal, the RF power amplifier comprising:

• a bias circuit, electrically connected to a first system voltage, the bias circuit providing a bias current, wherein when the first system voltage is larger than a first voltage threshold value, the bias circuit receives a first current rising slightly;
• a output-stage circuit, electrically connected to a second system voltage and the bias circuit, the output-stage circuit receiving the bias current for working at an operation bias point;
• and
• a RF compensation circuit, electrically connected to the bias circuit, wherein when first system voltage is larger than a second voltage threshold value, the RF compensation circuit receives a second current rising slightly transmitted from the bias circuit, wherein the second voltage threshold value is larger than the first voltage threshold value and when the first system voltage works in an operation voltage interval, current value of the first current is larger than current value of the second current and slope of rising slightly is identical to each other substantially, so that a quiescent operating current of the RF power amplifier is independent of change of the first system voltage,
• wherein when the first system voltage is larger than a third voltage threshold value, current value of the first current is equal to current value of the second current, so that the bias current is zero current for over-voltage protecting RF power amplifier, wherein the third voltage threshold value is larger than the second voltage threshold value,
• wherein when the first system voltage works in the operation voltage interval, current values of the first current and the second current increase with increasing of the ambient temperature, and rising magnitude is identical to each other substantially, so that the quiescent operating current is a current equal to or close to zero temperature coefficient.