Radio frequency amplifier circuitry
Radio frequency (RF) amplifier circuitry for amplifying an RF input signal to provide an RF output signal includes target envelope supply voltage compensation circuitry, envelope tracking power supply circuitry, and power amplifier circuitry. The target envelope supply voltage compensation circuitry is configured to compensate a target envelope supply voltage to provide a compensated target envelope supply voltage, which is used by the envelope tracking power supply circuitry to provide an output envelope supply voltage. The power amplifier circuitry is configured to amplify the RF input signal using a power amplifier envelope supply voltage. The power amplifier envelope supply voltage is different from the output envelope supply voltage due to a parasitic impedance. The target envelope supply voltage compensation circuitry is configured to compensate the target envelope supply voltage to reduce an error between the target envelope supply voltage and the power amplifier envelope supply voltage.
1. Radio frequency (RF) amplifier circuitry for amplifying an RF input signal to provide an RF output signal, the RF amplifier circuitry comprising:
target envelope supply voltage compensation circuitry configured to compensate a target envelope supply voltage to provide a compensated target envelope supply voltage;
envelope tracking power supply circuitry coupled to the target envelope supply voltage compensation circuitry, the envelope tracking power supply circuitry configured to provide an output envelope supply voltage based on the compensated target envelope supply voltage; and
power amplifier circuitry coupled to the envelope tracking power supply circuitry, the power amplifier circuitry configured to amplify the RF input signal using a power amplifier envelope supply voltage to provide the RF output signal, wherein:
the power amplifier envelope supply voltage is different from the output envelope supply voltage due to a parasitic impedance between the envelope tracking power supply circuitry and the power amplifier circuitry; and
the target envelope supply voltage compensation circuitry is configured to compensate the target envelope supply voltage to reduce an error between the target envelope supply voltage and the power amplifier envelope supply voltage.
2. The RF amplifier circuitry of claim 1 wherein the target envelope supply voltage indicates a voltage level of an envelope of the RF input signal.
3. The RF amplifier circuitry of claim 2 wherein the target envelope supply voltage compensation circuitry is located on the same die as the envelope tracking power supply circuitry.
4. The RF amplifier circuitry of claim 2 wherein the envelope tracking power supply circuitry and the power amplifier circuitry are located on different die.
5. The RF amplifier circuitry of claim 2 wherein the target envelope supply voltage compensation circuitry is configured to perform equalization on the target envelope supply voltage to provide the compensated target envelope supply voltage.
6. The RF amplifier circuitry of claim 1 wherein the target envelope supply voltage compensation circuitry is located on the same die as the envelope tracking power supply circuitry.
7. The RF amplifier circuitry of claim 1 wherein the envelope tracking power supply circuitry and the power amplifier circuitry are located on different die.
8. The RF amplifier circuitry of claim 1 wherein the target envelope supply voltage compensation circuitry is configured to perform equalization on the target envelope supply voltage to provide the compensated target envelope supply voltage.
9. The RF amplifier circuitry of claim 1 wherein providing the output envelope power supply voltage based on the compensated target envelope supply voltage comprises modulating a supply voltage based on the compensated target envelope supply voltage.
10. The RF amplifier circuitry of claim 1 wherein amplifying the RF input signal using the power amplifier envelope supply voltage comprises modulating the power amplifier envelope supply voltage based on the RF input signal.
11. A method for amplifying a radio frequency (RF) input signal to provide an RF output signal, the method comprising:
compensating a target envelope supply voltage to provide a compensated target envelope supply voltage;
providing an output envelope supply voltage based on the compensated target envelope supply voltage; and
amplifying the RF input signal using a power amplifier envelope supply voltage to provide the RF output signal, wherein:
the power amplifier envelope supply voltage is different from the output envelope supply voltage due to a parasitic impedance between envelope tracking power supply circuitry and power amplifier circuitry; and
compensating the target envelope supply voltage comprises compensating the target envelope supply voltage to reduce an error between the target envelope supply voltage and the power amplifier envelope supply voltage.
12. The method of claim 11 wherein the target envelope supply voltage indicates a voltage level of an envelope of the RF input signal.
13. The method of claim 12 wherein compensating the target envelope supply voltage comprises performing equalization on the target envelope supply voltage.
14. The method of claim 11 wherein compensating the target envelope supply voltage comprises performing equalization on the target envelope supply voltage.
15. The method of claim 11 wherein providing the output envelope supply voltage based on the compensated target envelope supply voltage comprises modulating a supply voltage based on the compensated target envelope supply voltage.
16. The method of claim 11 wherein amplifying the RF input signal using the power amplifier envelope supply voltage comprises modulating the power amplifier envelope supply voltage based on the RF input signal.