Granted Patent B2

US 12,401,332 · App. 17/939,372 · Granted Aug 26, 2025

Inventor: Nadim Khlat (Cugnaux, FR)

Assignee: Qorvo US, Inc.

H03F3/245H03F1/0222H03F1/3288H03F3/195H04B1/0475H03F2200/451H03F2201/3233H04B2001/0425

Abstract

Claims (73)

1. A transmission circuit comprising:

a power management integrated circuit (PMIC) comprising a phase correction circuit configured to:

receive a modulated target voltage tracking a time-variant input power of a radio frequency (RF) signal and an indication of a selected target frequency among a plurality of target frequencies for transmission of the RF signal;

determine a reference phase correction voltage predefined for a reference frequency based on the modulated target voltage;

determine a scaling factor corresponding to the selected target frequency; and

scale the determined reference phase correction voltage by the determined scaling factor to thereby generate a phase correction voltage; and

a power amplifier circuit comprising a phase shifter configured to:

determine a phase shift corresponding to the phase correction voltage; and

apply the phase shift to the RF signal to thereby generate a phase-shifted RF signal.

2. The transmission circuit of claim 1 , wherein:

the power amplifier circuit further comprises a power amplifier configured to amplify the phase-shifted RF signal based on a modulated voltage for transmission in the respective one of the plurality of target frequencies; and

the PMIC further comprises a voltage modulation circuit configured to generate the modulated voltage based on the modulated target voltage.

3. The transmission circuit of claim 1 , wherein the phase correction circuit comprises:

a phase correction voltage lookup table (LUT) circuit configured to determine the reference phase correction voltage predefined for the reference frequency based on the modulated target voltage; and

a scaling circuit configured to:

determine the scaling factor corresponding to the selected target frequency; and

multiply the reference phase correction voltage by the scaling factor to thereby generate the phase correction voltage.

4. The transmission circuit of claim 3 , wherein the scaling circuit comprises:

a scaling LUT circuit configured to determine the scaling factor corresponding to the selected target frequency; and

a multiplier configured to multiply the reference phase correction voltage by the scaling factor to generate the phase correction voltage.

5. The transmission circuit of claim 1 , wherein the reference frequency is identical to the selected target frequency among the plurality of target frequencies.

6. The transmission circuit of claim 1 , wherein the reference frequency is any one of the plurality of target frequencies.

7. The transmission circuit of claim 1 , further comprising a transceiver circuit configured to:

generate the RF signal based on an input vector and having the time-variant input power corresponding to a time-variant amplitude of the input vector; and

generate the modulated target voltage based on the time-variant amplitude of the input vector.

8. The transmission circuit of claim 7 , wherein the transceiver circuit comprises:

a digital processing circuit configured to generate the input vector associated with a plurality of time-variant group delays each corresponding to a respective one of the plurality of target frequencies; and

a delay equalizer circuit configured to:

equalize the input vector based on a delay equalization filter to thereby convert the plurality of time-variant group delays into a plurality of constant group delays each corresponding to the respective one of the plurality of target frequencies; and

generate a delay-equalized vector associated with a respective one of the plurality of constant group delays corresponding to the selected target frequency among the plurality of target frequencies; and

a signal conversion circuit configured to generate the RF signal for transmission in the selected target frequency based on the delay-equalized vector.

9. The transmission circuit of claim 8 , wherein the digital processing circuit is further configured to generate the indication of the selected target frequency among the plurality of target frequencies.

10. The transmission circuit of claim 8 , wherein the transceiver circuit further comprises:

an amplitude correction circuit configured to equalize the delay-equalized vector to thereby generate a delay-gain-equalized vector having a constant gain in the selected target frequency; and

a target voltage circuit configured to generate the modulated target voltage based on the delay-gain-equalized vector.

11. A method for correcting phase and amplitude errors in a transmission circuit comprising:

receiving a modulated target voltage tracking a time-variant input power of a radio frequency (RF) signal and an indication of a selected target frequency among a plurality of target frequencies for transmission of the RF signal;

determining a reference phase correction voltage predefined for a reference frequency based on the modulated target voltage;

determining a scaling factor corresponding to the selected target frequency;

scaling the determined reference phase correction voltage by the determined scaling factor to thereby generate a phase correction voltage;

determining a phase shift corresponding to the phase correction voltage; and

applying the phase shift to the RF signal to thereby generate a phase-shifted RF signal.

12. The method of claim 11 , further comprising:

amplifying the phase-shifted RF signal based on a modulated voltage for transmission in the respective one of the plurality of target frequencies; and

generating the modulated voltage based on the modulated target voltage.

13. The method of claim 11 , further comprising:

determining, from a phase correction voltage lookup table (LUT), the reference phase correction voltage predefined for the reference frequency based on the modulated target voltage; and

multiplying the reference phase correction voltage by the scaling factor to thereby generate the phase correction voltage.

14. The method of claim 11 , further comprising selecting the reference frequency to be:

identical to the selected target frequency among the plurality of target frequencies.

15. The method of claim 11 , further comprising selecting the reference frequency to be any one of the plurality of target frequencies.

16. The method of claim 11 , further comprising:

generating the RF signal based on an input vector and having the time-variant input power corresponding to a time-variant amplitude of the input vector; and

generating the modulated target voltage based on the time-variant amplitude of the input vector.

17. The method of claim 16 , further comprising:

generating the input vector associated with a plurality of time-variant group delays each corresponding to a respective one of the plurality of target frequencies;

equalizing the input vector based on a delay equalization filter to thereby convert the plurality of time-variant group delays into a plurality of constant group delays each corresponding to the respective one of the plurality of target frequencies;

generating a delay-equalized vector associated with a respective one of the plurality of constant group delays corresponding to the selected target frequency among the plurality of target frequencies; and

generating the RF signal for transmission in the selected target frequency based on the delay-equalized vector.

18. The method of claim 17 , further comprising:

equalizing the delay-equalized vector to thereby generate a delay-gain-equalized vector having a constant gain in the selected target frequency; and

generating the modulated target voltage based on the delay-gain-equalized vector.

19. The transmission circuit of claim 1 , wherein the reference frequency is a center frequency of a modulation bandwidth of the transmission circuit.

20. A wireless device comprising a transmission circuit, the transmission circuit comprises:

a power management integrated circuit (PMIC) comprising a phase correction circuit configured to:

receive a modulated target voltage tracking a time-variant input power of a radio frequency (RF) signal and an indication of a selected target frequency among a plurality of target frequencies for transmission of the RF signal;

determine a reference phase correction voltage predefined for a reference frequency based on the modulated target voltage;

determine a scaling factor corresponding to the selected target frequency; and

scale the determined reference phase correction voltage by the determined scaling factor to thereby generate a phase correction voltage; and

a power amplifier circuit comprising a phase shifter configured to:

determine a phase shift corresponding to the phase correction voltage;

apply the phase shift to the RF signal to thereby generate a phase-shifted RF signal; and

amplify the phase-shifted RF signal based on a modulated voltage for transmission in the selected target frequency.

Assignments (1)

Continuity (3)

References Cited (267)