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Peer-Review Record

Coplanar Asymmetry Transformer Distributed Modeling for X-Band Drive Power Amplifier Design on GaN Process

Electronics 2022, 11(16), 2478; https://doi.org/10.3390/electronics11162478
by Yihui Fan 1,2,3, Jing Wan 1,2,3, Zhe Yang 1,2,3, Shengli Zhang 1,2,3, Jinxiang Zhao 1,2,3, Gong Gao 1,2,3, Xiaojie Zhang 1,2,3, Haoyu Shen 1,2, Nan Xiao 1,2, Yuying Zhang 1,2,3, Yuepeng Yan 1,2,3 and Xiaoxin Liang 1,2,3,*
Reviewer 1:
Reviewer 2:
Reviewer 3: Anonymous
Reviewer 4:
Reviewer 5:
Electronics 2022, 11(16), 2478; https://doi.org/10.3390/electronics11162478
Submission received: 13 June 2022 / Revised: 26 July 2022 / Accepted: 31 July 2022 / Published: 9 August 2022
(This article belongs to the Section Circuit and Signal Processing)

Round 1

Reviewer 1 Report

A small comparison with previous similar works could be useful.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

.) Fig. 1: An example of a vertical transformer should be given in Fig. 1 and discussed in chapter 2.2. A detailed description of the vertical transformer analyzed in Fig. 2 should be given.

.) The abbreviation Fsrf should be explained

.) Is Fig. 2 a simulation or a measurement. If it is a simulation, explain the simulation conditions, simulation model and simulation software.

.) Fig. 3: What is the trace width? Please describe

Author Response

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Author Response File: Author Response.pdf

Reviewer 3 Report

The submitted paper is dealing with the coplanar asymmetry transformer distributed model for PA design on GaN technology process including the  related transformer-based matching circuit with the design methodology. The paper has been structured well.  I would ask the authors to include state-of-the-art papers in the references. It would be well to state the SPICE model parameters of the transistors to be used in the PA design in the paper. Can you please give more information on the principle operation performance parameters of the designed PA for varing input power levels to state 1dB compression point for instance and PAE value?

Author Response

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Author Response File: Author Response.docx

Reviewer 4 Report

In this paper, authors propose a coplanar asymmetry transformer distributed model for the power amplifier implemented using GaN process. The paper is well organized. I have the following comments for improving the paper. 

(1) Please insert the legend in Figs. 6 and 7.

(2) It would be better if the efficiency were added in Fig. 14.

(3) In Fig. 4, the coupling coefficient at the trace space of 10 um shows the difference compared to the other value. Please rigorously analyze the discrepancy and explain the reason.

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 5 Report

Thank you very much for the material sent. It's an interesting job. Nevertheless, I have some suggestions:

1. I am asking for an in-depth review of the literature. Many researchers are interested not only in construction, materials science, but also in design methods.

2. How does your work compare with the increasing use of SIC?

3. Can I use your method to design other transformers?

Best regards

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 2 Report

The paper is now ready for publication

Author Response

Thanks for your nice advice.

Reviewer 4 Report

Thank you for considering reviewer's comments. Authors clearly addressed my concerns on this paper. 

Author Response

Thanks for your nice advice.

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