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Volume 11
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Article
Peer-Review Record

A Wideband 6-Bit Digital Attenuator in a GaAs pHEMT MMIC

Electronics 2022, 11(14), 2166; https://doi.org/10.3390/electronics11142166
by Dongning Hao 1, Wei Zhang 1, Xiubo Liu 1 and Yanyan Liu 2,*
Reviewer 2:
Ickhyun Song
Reviewer 3:
Myunghoi Kim
Electronics 2022, 11(14), 2166; https://doi.org/10.3390/electronics11142166
Submission received: 9 June 2022 / Revised: 29 June 2022 / Accepted: 2 July 2022 / Published: 11 July 2022
(This article belongs to the Special Issue Advanced RF, Microwave, and Millimeter-Wave Circuits and Systems)

Round 1

Reviewer 1 Report

In indroduction authors state that they adopt a modified π-type attenuator structure with additional compensation capacitance. Althouth, they use modified reduced T-type and bridged T-type attenuators. What is more, the parasitic effect of through-wafer via (TWV) is not analyzed adequetly. The input and output ports are both grounded by Through-Wafer-Via, but it is not very clear how those two TWV (or more in parallel) are implemented and which is the trade-off in dimensions (may a simulation inter-section photo could help to clarify it). The photo in fig. 5 of the proposed attenuator, has to be larger and clearer.

 

Author Response

Please see the attachment

Author Response File: Author Response.pdf

Reviewer 2 Report

The manuscript presents a wideband 6 bits digital attenuator in GaAs pHEMT MMIC. Overall, the idea presented in the manuscript is incremental or marginal in comparison with the state-of-the art designs. Theoretical analysis needs to be included for performance optimization and tuning.

Author Response

Please see the attachment

Author Response File: Author Response.pdf

Reviewer 3 Report

In this paper, authors present a wideband 6 bits digital attenuator using GaAs MMIC technology. The main contribution of this paper is to present the design method for the attenuator using an equivalent model of the TWV. It substantially improves the accuracy of the MMIC attenuator. I suggest the comment as follows.

- It would be better if the simulated results of S21 with and without TWV for whole attenuator circuit were presented. It can emphasize the authors' idea.

- Please include the measurement setup in the revision

 

Author Response

Please see the attachment

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

The manuscript presents improvements in wideband attenuator design and I do not have any further questions about technical aspects.

Author Response

Thanks for your comments.

Reviewer 3 Report

Thank you for considering the reviewer's comments.

Author Response

Thanks for your comments.

This manuscript is a resubmission of an earlier submission. The following is a list of the peer review reports and author responses from that submission.


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