Boost circuit for use in power amplifier

A boost circuit for use in a power amplifier comprising:

• an input end arranged to output a reference voltage;
• a first output end arranged to output an operational current;
• a reference end arranged to couple to a reference level;
• a voltage-to-voltage generator coupled to the input end and configured to generate a converting voltage according to the reference voltage, wherein an absolute value of a rising edge slope on a waveform of the converting voltage is smaller than an absolute value of a rising edge slope on a waveform of the reference voltage or an absolute value of a falling edge slope on the waveform of the converting voltage is smaller than an absolute value of a falling edge slope on the waveform of the reference voltage;
• a voltage-to-current generator coupled to the voltage-to-voltage generator and configured to convert the converting voltage into a first current, wherein a waveform of the first current corresponds to a waveform of the converting voltage;
• and
• a differential current generator coupled between the input end and the voltage-to-current generator and configured to generate a second current associated the waveform the reference voltage and output the operational current, wherein the operational current is associated with the first current and the second current.