IP Library › Granted Patent US 12,470,175
Granted Patent B2
US 12,470,175 · App. 17/844,944 · Granted Nov 11, 2025

Autonomous analog orthogonal load modulation power amplifier

Inventor: Kevin Wesley Kobayashi (Redondo Beach, CA)
Assignee: Qorvo US, Inc.
H03F1/0288H03F3/195H03F3/245H03F3/602H03F2200/192H03F2200/204H03F2200/451
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Quick Facts
Patent No.
US 12,470,175
App. No.
17/844,944
Granted
Nov 11, 2025
Kind
B2
Abstract

A load modulation amplifier is disclosed having a first amplifier and a second amplifier. An input quadrature coupler and an output quadrature coupler are coupled between the first amplifier and the second amplifier. A splitter has a first splitter output, a splitter input coupled to a signal input, and a second splitter output coupled to a second port of the input quadrature coupler, and a variable attenuator is coupled between the first splitter output and a first port of the input quadrature coupler. An attenuation controller has a controller output that is coupled to an attenuation control input of the variable attenuator, wherein the attenuation controller autonomously generates a control signal in response to a power sample signal in proportion to a radio frequency signal received at the radio frequency signal input.

Claims (28)

1 . A load modulation amplifier comprising:

a first amplifier having a first input and a first output;

a second amplifier having a second input and a second output;

an input quadrature coupler having a first port, a second port, a third port, and a fourth port, wherein the third port of the input quadrature coupler is coupled to the second input of the second amplifier and the fourth port of the input quadrature coupler is coupled to the first input of the first amplifier;

an output quadrature coupler having a first port, a second port, a third port, and a fourth port, wherein the first port of the output quadrature coupler is coupled to the second output of the second amplifier and the second port of the output quadrature coupler is coupled to first output of the first amplifier;

a splitter having a first splitter output, a splitter input coupled to a radio frequency (RF) signal input, and a second splitter output coupled to the second port of the input quadrature coupler;

a variable attenuator coupled between the first splitter output and the first port of the input quadrature coupler; and

a termination impedance coupled to the fourth port of the output quadrature coupler, wherein the termination impedance is a reflective complex impedance having a non-50 ohm real part that is either greater than 0 and less than 35 ohm or greater than 75 ohm.

2 . The load modulation amplifier of claim 1 further comprising an attenuation controller having a controller output that is coupled to an attenuation control input of the variable attenuator, wherein the attenuation controller autonomously generates a control signal in response to a power sample signal in proportion to an RF signal received at the RF signal input.

3 . The load modulation amplifier of claim 2 wherein the attenuation controller is an analog conditioning circuit that is configured to amplify the power sample signal.

4 . The load modulation amplifier of claim 2 wherein the attenuation controller is an analog conditioning circuit that is configured to level shift the power sample signal.

5 . The load modulation amplifier of claim 2 wherein the attenuation controller is an analog conditioning circuit that is configured to filter the power sample signal.

6 . The load modulation amplifier of claim 2 wherein the attenuation controller is an analog conditioning circuit that is configured to amplify, level shift, and filter the power sample signal.

7 . The load modulation amplifier of claim 2 further comprising an RF coupler that is coupled between the RF input and the splitter input.

8 . The load modulation amplifier of claim 3 further comprising an RF detector coupled between an output on the RF coupler and an input of the attenuation controller.

9 . The RF detector of claim 3 wherein the detector creates a voltage control signal that is linear in voltage with respect to the RF coupled and detected input power in dBm.

10 . The load modulation amplifier of claim 1 , wherein voltage supplying the second amplifier is greater than the voltage supplying the first amplifier when the termination impedance is substantially a shorted impedance.

11 . The load modulation amplifier of claim 10 , wherein the attenuation is greater than 3 dB.

12 . The load modulation amplifier of claim 1 further comprising a phase shifter coupled between the variable attenuator and the first port of the quadrature coupler.

13 . The load modulation amplifier of claim 12 wherein the phase shifter generates a phase shift between 0 degrees and 130 degrees.

14 . The load modulation amplifier of claim 12 wherein the phase shifter generates a phase shift between 130 degrees and 180 degrees.

15 . The load modulation amplifier of claim 12 wherein the phase shifter generates a phase shift of substantially 0 degrees when the termination impedance is substantially an open impedance.

16 . The load modulation amplifier of claim 12 wherein the phase shifter generates a phase shift of substantially 145 degrees when the termination impedance is substantially a shorted impedance.

17 . The load modulation amplifier of claim 1 wherein first power amplifier and second power amplifier are configured to have substantially the same quiescent bias.

18 . The load modulator amplifier of claim 1 further comprising a delay element that is coupled between the second splitter output and the second port of the input quadrature coupler, wherein the delay element is configured to maintain substantially zero phase difference between split portions of an RF signal due to a delay introduced by the variable attenuator.

19 . The load modulation amplifier of claim 1 wherein at least one of the first amplifier and the second amplifier is further configured to receive a modulated supply voltage from a modulation power supply.

20 . The load modulation amplifier of claim 1 , wherein voltage supplying the first amplifier is greater than the voltage supplying the second amplifier when the termination impedance is substantially an open impedance.

21 . The load modulation amplifier of claim 20 , wherein the attenuation is greater than 3 dB.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 21, 2022
From: KOBAYASHI, KEVIN WESLEY
To: QORVO US, INC.
Reel/Frame 060259/0679 →
Continuity (2)
Provisional Application 63254243 · Oct 11, 2021
Related Publication 20230109932A1 · Apr 13, 2023
References Cited (54)
US 9484865B2 · Kobayashi et al. · 2016 [cited by applicant]
US 9774299B2 · Staudinger · 2017 [cited by examiner]
US 9887671B2 · Kobayashi et al. · 2018 [cited by applicant]
US 9948243B2 · Kobayashi et al. · 2018 [cited by applicant]
US 10389311B1 · Kobayashi · 2019 [cited by applicant]
US 20110183636A1 · Staudinger et al. · 2011 [cited by applicant]
US 20120105147A1 · Harris et al. · 2012 [cited by applicant]
US 20140159818A1 · Jeon et al. · 2014 [cited by applicant]
US 20140375389A1 · Jeon et al. · 2014 [cited by applicant]
US 20150091653A1 · Kobayashi et al. · 2015 [cited by applicant]
US 20150145600A1 · Hur et al. · 2015 [cited by applicant]
US 20160241202A1 · Lehtola et al. · 2016 [cited by applicant]
US 20170019071A1 · Kobayashi et al. · 2017 [cited by applicant]
US 20170019072A1 · Kobayashi et al. · 2017 [cited by applicant]
US 20170244366A1 · Hellberg et al. · 2017 [cited by applicant]
US 20180278214A1 · Jin et al. · 2018 [cited by applicant]
US 20210408972A1 · Watkins · 2021 [cited by examiner]
US 20240297620A1 · Jin · 2024 [cited by examiner]
CN 102355198A · 2012 [cited by applicant]
CN 104579186A · 2015 [cited by applicant]
CN 106575947A · 2017 [cited by applicant]
EP 2141798B1 · 2011 [cited by applicant]
JP 2008035487A · 2008 [cited by applicant]
JP 2012075193A · 2012 [cited by applicant]
JP 2016144015A · 2016 [cited by applicant]
KR 20070015719A · 2007 [cited by applicant]
KR 20110085340A · 2011 [cited by applicant]
KR 20160070783A · 2016 [cited by applicant]
WO WO2004105339A3 · 2005 [cited by examiner]
WO 2006066461A1 · 2006 [cited by applicant]
WO 2008136080A1 · 2008 [cited by applicant]
WO 2015077497A1 · 2015 [cited by applicant]
WO WO2021228396A1 · 2021 [cited by examiner]
Nash, et.al, RMS detector for RF power and return loss measurement, Analogue Dialogue 52-05, May 2018 (Year: 2018). [cited by examiner]
First Office Action for Chinese Patent Application No. 201811417441.6, mailed Jul. 3, 2024, 20 pages. [cited by applicant]
Notice of Reason for Rejection for Japanese Patent Application No. 2018216987, mailed Nov. 15, 2022, 6 pages. [cited by applicant]
Decision to Grant for Japanese Patent Application No. 2018216987, mailed Apr. 7, 2023, 5 pages. [cited by applicant]
Examination Report for European Patent Application No. 18204547.6, mailed Sep. 14, 2022, 7 pages. [cited by applicant]
Written Decision on Registration for Korean Patent Application No. 1020180149302, mailed Nov. 28, 2023, 7 pages. [cited by applicant]
Cao, Y. et al., “Load Modulated Balanced Amplifier with Reconfigurable Phase Control for Extended Dynamic Range,” 2019 IEEE/MTT-S International Microwave Symposium, Jun. 2-7, 2019, Boston, MA, USA, IEEE, pp. 1335-1338. [cited by applicant]
Examination Report for German Patent Application No. 102022125498.5, mailed Jun. 22, 2023, 16 pages. [cited by applicant]
Andersson, K., et al., “GaN Powers Microwave Point-to-Point Radios,” Microwave Journal, vol. 60, No. 2, Feb. 2017, pp. 22-34. [cited by applicant]
Collins, D.J., “The Orthogonal LMBA: A Novel RFPA Architecture With Broadband Reconfigurability,” IEEE Microwave and Wireless Components Letters, vol. 30, No. 9, Sep. 2020, first published Jul. 2020, IEEE, pp. 888-891. [cited by applicant]
Kobayashi, K. W., et al., “An 18-21 GHz InP DHBT Linear Microwave Doherty Amplifier,” 2000 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Jun. 10-13, 2000, Boston, Massachusetts, USA, pp. 179-182. [cited by applicant]
Kobayashi, K. W., et al., “Indium Phosphide Heterojunction Bipolar Transistor Technology for Future Telecommunications Applications,” Microwave Journal, Jul. 1999, 12 pages. [cited by applicant]
Pednekar, P. H., et al., “RF-Input Load Modulated Balanced Amplifier,” 2017 IEEE MTT-S International Microwave Symposium (IMS), Jun. 4-9, 2017, Honolulu, Hawaii, USA, 4 pages. [cited by applicant]
Shepphard, D. J., et al., “An Efficient Broadband Reconfigurable Power Amplifier Using Active Load Modulation,” IEEE Microwave and Wireless Components Letters, vol. 26, No. 6, Jun. 2016, pp. 443-445. [cited by applicant]
Shepphard, D. J., et al., “A Broadband Reconfigurable Load Modulated Balanced Amplifier (LMBA), ” 2017 IEEE MTT-S International Microwave Symposium (IMS), Jun. 4-9, 2017, Honolulu, Hawaii, USA, 3 pages. [cited by applicant]
Non-Final Office Action for U.S. Appl. No. 15/884,605, mailed Feb. 11, 2019, 6 pages. [cited by applicant]
Final Office Action for U.S. Appl. No. 15/884,605, mailed Mar. 18, 2019, 6 pages. [cited by applicant]
Extended European Search Report for European Patent Application No. 18204547.6, mailed May 16, 2019, 7 pages. [cited by applicant]
Examination Report for European Patent Application No. 18204547.6, mailed Mar. 4, 2021, 6 pages. [cited by applicant]
Notice of Preliminary Rejection for Korean Patent Application No. 10-2018-0149302, mailed Sep. 25, 2023, 9 pages. [cited by applicant]
Rusanen, J. et al., “Ka-Band Orthogonal Load-Modulated Balanced Amplifier in 22 nm CMOS FDSOI,” Proceedings of the 17th European Microwave Inegrated Circuits Conference, Sep. 26-27, 2022, Milan, Italy, IEEE, pp. 161-164. [cited by applicant]