Linearizers for &lt;inline-formula&gt; 
                     &lt;tex-math notation="LaTeX"&gt;${Q}$ &lt;/tex-math&gt;
                  &lt;/inline-formula&gt;- and &lt;inline-formula&gt; 
                     &lt;tex-math notation="LaTeX"&gt;${V}$ &lt;/tex-math&gt;
                  &lt;/inline-formula&gt;-Band TWTAs

Katz, A.; Gray, Robert; Dorval, Roger

doi:10.1109/ted.2018.2806199

Cited by 11 publications

(6 citation statements)

References 6 publications

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“…The design in [7] shows good linear performance, but the structure using vector combination is complex. The design in [4] also shows good linear performance, but the technical information of APD is not mentioned. The design in [3] shows the ability of frequencydependent phase conversion, but frequency-dependent gain conversion is not mentioned and the structure is complex.…”

Section: Methodsmentioning

confidence: 99%

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A New Design Methodology for Wideband Analog Predistorter With the Characteristics of Frequency-Dependent Gain and Phase Conversions

et al. 2020

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A novel design method, which can transform the nonlinear circuits design to the impedance matching network (IMN) design, is proposed for wideband analog predistoter (APD) with the characteristics of frequency-dependent gain and phase conversions in this paper. First, the design method for the desired gain and phase conversions is introduced. The ABCD parameters of the IMN can be computed. To simplify the design, the obtained parameters are transformed to the IMN terminal impedance. Then we can only need to design the IMN terminal impedance to obtain the desired transfer characteristics. In the meanwhile, an APD with 4.5 dB gain conversion and 50 • phase conversion is designed and simulated to validate the design method for specify gain and phase conversions. The simulated results show good effectiveness of the design method. Second, for wideband application, the complex gain and phase conversions surface design is transformed to the IMN terminal impendence curve versus frequency design. This gives the designers a well-defined strategy for wideband APD design focusing on frequency-dependent phase conversion as well as gain conversion. To validate the proposed method, a wideband APD operating at K-band (17-20 GHz) is designed, fabricated and measured. A linearized 100W K-band TWTA is shown to achieve a noise power ratio (NPR) >20 dB at 3 dB output power back-off, and phase change <6.5 • among the operating band. INDEX TERMS Wideband analog predistorter, impedance matching network, terminal impedance.

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Section: Methodsmentioning

confidence: 99%

“…But the circuit design is complicated and the gain conversion is not mentioned. In [4], Q-band (43.5-45.5 GHz) and V-band (47-52 GHz) APDs have been proposed for using with satellite communications (SATCOM) ground station TWTAs. But this paper lacks of technical information concerning the APD solution.…”

Section: Introductionmentioning

confidence: 99%

A New Design Methodology for Wideband Analog Predistorter With the Characteristics of Frequency-Dependent Gain and Phase Conversions

et al. 2020

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“…With the increasing communication capacity demand of satellite communication systems, the signal bandwidth has been recently improved to scales of hundreds of MHz or even a few GHz [1]. Consequently, higher-order modulation methods such as QPSK, 16APSK, and OFDM are being employed to improve spectrum utilization.…”

Section: Introductionmentioning

confidence: 99%

A Broadband Analog Predistortion Linearizer Based on GaAs MMIC for Ka-Band TWTAs

Liu

Wang

et al. 2023

Electronics

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In this article, a Ka-band broadband analog predistortion (APD) microwave monolithic integrated circuit (MMIC) with independent tunability based on a 0.15 μm GaAs pHEMT process is proposed, which can be cascaded in front of traveling wave tube amplifiers (TWTAs) to improve their linearity. The influence of different diode sizes on the parameters of Schottky diodes is analyzed and used to design the gain and phase nonlinear branches. The broadband APD MMIC is realized based on a dual-branch vector synthesis design and nonlinear frequency adjust module (NFAM). The independent tunability and broadband characteristics of the APD MMIC are verified by simulated and measured results with an error of less than 5%. Furthermore, a Ka-band 60 W TWTA is linearized by the APD MMIC, and the gain and phase compressions are reduced from 8 dB and 50° to within 3 dB and 12°, respectively. The third-order intermodulation (C/IM3) is greater than 28 dBc and noise power ratio (NPR) is greater than 15.7 dBc at 3 dB output power backoff (OPBO) over the operating band of 25.1~27.5 GHz, indicating that the APD MMIC can improve the nonlinearity of TWTA effectively under broadband signals.

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“…Owing to its wideband operation, and high frequency, analog predistortion is commonly used in microwave and millimeter wave systems. [7][8][9][10][11][12][13][14][15][16] Figure 1 shows the measured one-tone AM/AM and AM/PM vs input power and frequency of a Q/V band TWTA. From Figure 1, we can see that the nonlinear characteristics of TWTA not only related to input power but also related to frequency.…”

Section: Introductionmentioning

confidence: 99%

Complete analysis and design for a Q/V band (46‐52 GHz ) wideband analog predistorter

Bian

Zhang

Deng

et al. 2020

Int J RF Microw Comput Aided Eng

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This article shows the complete analysis and design for a Q/V (46-52 GHz) band wideband analog predistorter (APD). First, the reflection coefficient for hybrid coupler's through port with complex impedance is corrected. Second, the acceptable error region is introduced to analyze the influence of different nonlinear loads. Levenberg-Marquardt algorithm is then used to solve the circuit parameters of the hybrid T matching network. Finally, a Q/V band (46-52 GHz) wideband APD is fabricated and measured. The measurement results are in good agreement with the analysis results. Furthermore, the linearized traveling-wave tube amplifiers (TWTA) gain compression is less than 0.5 dB, and the phase change of TWTA after linearization is less than 4. The C/IM3 shows more than 10 dB improvement.

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Linearizers for <inline-formula> <tex-math notation="LaTeX">${Q}$ </tex-math> </inline-formula>- and <inline-formula> <tex-math notation="LaTeX">${V}$ </tex-math> </inline-formula>-Band TWTAs

Cited by 11 publications

References 6 publications

A New Design Methodology for Wideband Analog Predistorter With the Characteristics of Frequency-Dependent Gain and Phase Conversions

A New Design Methodology for Wideband Analog Predistorter With the Characteristics of Frequency-Dependent Gain and Phase Conversions

A Broadband Analog Predistortion Linearizer Based on GaAs MMIC for Ka-Band TWTAs

Complete analysis and design for a Q/V band (46‐52 GHz ) wideband analog predistorter

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