A Design Method for Analog Predistortion Circuit of K-band TWT

LIU Ting; SU Xiaobao; WANG Gang; ZHAO Bin

doi:10.11999/JEIT221181

Volume 45 Issue 12

Dec. 2023

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Article Navigation > Journal of Electronics & Information Technology > 2023 > 45(12): 4576-4584

LIU Ting, SU Xiaobao, WANG Gang, ZHAO Bin. A Design Method for Analog Predistortion Circuit of K-band TWT[J]. Journal of Electronics & Information Technology, 2023, 45(12): 4576-4584. doi: 10.11999/JEIT221181

Citation:

LIU Ting, SU Xiaobao, WANG Gang, ZHAO Bin. A Design Method for Analog Predistortion Circuit of K-band TWT[J]. Journal of Electronics & Information Technology, 2023, 45(12): 4576-4584. doi: 10.11999/JEIT221181

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A Design Method for Analog Predistortion Circuit of K-band TWT

doi: 10.11999/JEIT221181

LIU Ting^{1, 2
,
,},
SU Xiaobao^{1, 2},
WANG Gang^{1, 2},
ZHAO Bin¹

1.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2022-09-08
Accepted Date: 2022-12-20
Rev Recd Date: 2022-12-20

Available Online: 2022-12-23

Publish Date: 2023-12-26

Abstract

Abstract

The requirement of miniaturization and lightweight of space Travelling Wave Tube (TWT) predistortion circuit makes the circuit debugging more difficult. Therefore, an accurate simulation and design method of predistortion circuit is urgently needed to guide the product design. Based on the analysis of Schottky diode equivalent circuit model, the diode MA4E2039 is selected as a nonlinear generator, and the diode simulation model of MA4E2039 is established. Then, the key parameters affecting the performance of the circuit are obtained by analyzing the structure of the reflective predistortion circuit, and these key parameters are simulated accurately in the co-simulation stage of components and layout. Finally, the pre-distortion circuit processed according to the simulation results is tested, and it is found that the deviation between the simulation results and the measured results is less than 15%. By cascading the predistortion circuit with the K-band TWTA, the third-order intermodulation reaches 23.77 dBc while the IBO=4 dB. Therefore, this method can be used to guide the design of pre-distortion circuit of space TWT, help to improve the product development cycle, and also has important guiding significance for the miniaturization design of pre-distortion circuit.
- Travelling Wave Tube (TWT),
- Analog predistortion,
- Schottky diode,
- Expansion of gain and phase

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References(14)

References

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