Envelope tracking method and device

An envelope tracking device, comprising an amplifier circuit and a boost circuit, wherein the amplifier circuit comprises an operational amplifier and a feedback network;

• the operational amplifier comprises a non-inverting input terminal, a power supply negative terminal, a power supply positive terminal, an inverting input terminal and an output terminal of the operational amplifier, a reference voltage VREF is applied on the non-inverting input terminal, the power supply negative terminal is connected to a first voltage supply VEE, the power supply positive terminal is connected to a second voltage supply VCC, the reference voltage VREF has a voltage value greater than a voltage value of the first voltage supply VEE, the reference voltage VREF has a voltage value smaller than a voltage value of the second voltage supply VCC, and the voltage value of the first voltage supply VEE is greater than zero;
• a first terminal of the boost circuit receives a target envelope tracking input current signal, and a second terminal of the boost circuit is connected to the inverting input terminal, and configured to transmit the target envelope tracking input current signal to the inverting input terminal via the boost circuit, wherein the target envelope tracking input current signal is then transmitted to the operational amplifier;
• a first terminal of the feedback network is connected to the inverting input terminal, and a second terminal of the feedback network is connected to an output terminal of the operational amplifier, and configured to transmit an output voltage signal of the output terminal of the operational amplifier to the inverting input terminal;
• and
• the amplifier circuit is configured to perform closed-loop conversion and amplification on the target envelope tracking input current signal, and the output terminal of the operational amplifier outputs an envelope tracking output voltage,
• wherein the boost circuit comprises a stabilized voltage supply;
• or the boost circuit comprises a zener diode and a capacitor, the zener diode is connected in parallel with the capacitor, and one terminal where a positive electrode of the zener diode is connected in parallel with the capacitor serves as the first terminal of the boost circuit.