Linearization of Analog Domain Power Amplifier Based on Two-channel Nonlinear Feedback Architecture

QUAN Xin; ZHANG Mengyao; LIU Jian; PU Yunyi; LIU Ying; SHAO Shihai; TANG Youx​​​​​​​i

doi:10.11999/JEIT221289

Volume 45 Issue 12

Dec. 2023

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Article Navigation > Journal of Electronics & Information Technology > 2023 > 45(12): 4211-4217

QUAN Xin, ZHANG Mengyao, LIU Jian, PU Yunyi, LIU Ying, SHAO Shihai, TANG Youxi. Linearization of Analog Domain Power Amplifier Based on Two-channel Nonlinear Feedback Architecture[J]. Journal of Electronics & Information Technology, 2023, 45(12): 4211-4217. doi: 10.11999/JEIT221289

Citation:

QUAN Xin, ZHANG Mengyao, LIU Jian, PU Yunyi, LIU Ying, SHAO Shihai, TANG Youxi. Linearization of Analog Domain Power Amplifier Based on Two-channel Nonlinear Feedback Architecture[J]. Journal of Electronics & Information Technology, 2023, 45(12): 4211-4217. doi: 10.11999/JEIT221289

Citation:

QUAN Xin, ZHANG Mengyao, LIU Jian, PU Yunyi, LIU Ying, SHAO Shihai, TANG Youxi. Linearization of Analog Domain Power Amplifier Based on Two-channel Nonlinear Feedback Architecture[J]. Journal of Electronics & Information Technology, 2023, 45(12): 4211-4217. doi: 10.11999/JEIT221289

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Linearization of Analog Domain Power Amplifier Based on Two-channel Nonlinear Feedback Architecture

doi: 10.11999/JEIT221289

1.
School of Information Science and Technology, Southwest Jiaotong University, Chengdu 611756, China
2.
National Key Laboratory of Science and Technology on Communications, University of Electronic Science and Technology of China, Chengdu 611731, China

Funds: The National Natural Science Foundation of China (62071094, 61901396)

Received Date: 2022-10-11
Rev Recd Date: 2023-04-12

Available Online: 2023-04-19

Publish Date: 2023-12-26

Abstract

Abstract

In this paper, a dual-channel nonlinear feedback architecture is proposed to suppress nonlinear distortion of Power Amplifiers (PA) in the analog domain to improve PA linearity and reduce adjacent channel leakage. In this architecture, a nonlinear extraction loop and a feedback adjustment loop are included to suppress the nonlinearity. First, in the nonlinear extraction loop, the PA input and output signals are extracted by a coupler and aligned with amplitude and phase. Then the two signals are combined to cancel the linear signal and obtain the nonlinear distortion generated by PA. Next, in the feedback adjustment loop, two independent analog channels are used to modify the amplitude and delay of the extracted nonlinear signal before injecting into the PA input port. The delays of these two channels can be finely tuned to ensure the whole feedback structure to behave like a second-order Delta-Sigma modulator, and it shows better distortion suppression performance compared with the single-channel nonlinear feedback architecture. By configuring the feedback channel parameters through the proposed method, flexible suppression of nonlinear distortion at different target frequency ranges can be achieved. An experimental platform using a commercial PA chip CMPA0060002F is designed for verification. For a test signal with a bandwidth of 40 MHz and a carrier frequency of 780 MHz, under the current hardware feedback delay of 6 ns, the Adjacent Channel Leakage Ratio (ACLR) single sideband can be improved by 11 dB or double sideband is improved by 6 dB, with a total feedback delay of 6 ns. Better performance can be expected by integrating this method into the PA designing stage with a reduced feedback delay.
- Power Amplifier (PA),
- Nonlinear distortion,
- Linearization,
- Analog domain,
- Nonlinear feedback architecture

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References(20)

References

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