A Novel Multifunctional Negative Group Delay Circuit for Realizing Band-Pass, High-Pass and Low-Pass

Round 1

Reviewer 1 Report

Lack of spaces between the sentences.

Line 73    0.The      should be      0. The           The same problem in lines: 21, 112, 203.

Line 249    2015,vol.     should be 2015, vol.   The same problem in lines: 251, 254, 257, 259, 266, 268, 270, 272, 274, 280, 282, 283, 290, 295, 297, 303.

Comma in wrong position.

Line 78       (8) ,when        should be     (8), when    The same problem in lines: 137, 149.

The number overlaps equation (2).

 

According to the International System of Units SI, in the expression for the value of a quantity a space is left between the numerical value and the unit symbol.

E.g. in line 75         should be .  The same problem in lines: Table 1, 113, 114, 118, 119, Table 2, 129, Table 3, 160, 161, 162, 176, 177, 178, 179, 180, Table 6, 183, 186,187, 194, 197, Table 7, 203, 206, 207, 215, 218, Table 8.

Line 129    50 ohms    should be     

Table 4    KHz    should be kHz

Why the headings of  columns of tables are different:

Table 1 and Table 3    

Table 2 and Table 5    

Table 6 and Table 7   

Line 208  change the font size.

Comments for author File: Comments.pdf

Author Response

Dear Professor:

Please see the attachment.

Thank you very much for your review,which makes my paper more standardized and perfect.

 

 

 

Author Response File: Author Response.pdf

Reviewer 2 Report

Although the paper presents one of the interesting topics these days, I have some recommendations/requests to improve the paper:

• Please re-check the English, e.g. line 39: "...imedance is gave in...", line 89: "...is got...";
• Rearranging the tables, or at least highlighting the changing parameter will improve the readability;
• The legends in the graphs should contain the changing parameter instead of numbered states;
• The authors should discuss more the differences between simulations and experimental results, stress more the possible sources;
• If possible, the simulations should took into account at least one  (dominant) parasitic parameter;
• The authors should state why they have chosen the specific frequencies in the analyses.

Author Response

Dear Professor:

Please see the attachment.

Thank you very much for your review,which makes my paper more standardized and perfect.

Author Response File: Author Response.pdf

Reviewer 3 Report

The authors have presented a multifunctional negative group delay circuit for low-pass, high-pass and band-pass filters. The manuscript is written well, however the authors can address the following:

1. In which applications the proposed negative delay circuit (NLD) can be used? Provide applicability of the NLD in practical cases.
2. Is there the same NGD circuit as shown in fig. 7(a) has been used for high-pass, low-pass and band-pass cases or different circuit is being fabricated for each case?
3. Can the circuit be made tunable to operate on two or more frequencies?
4. Please provide future work and how the design can be further improved.

Author Response

Dear Professor:

Please see the attachment.

Thank you very much for your review,which makes my paper more standardized and perfect.

Author Response File: Author Response.pdf

Reviewer 4 Report

Some comments to the authors:

1) in the Formula (4) there is no dependence of the τ from inductance value of the circuit. There is no any comments about it. However, in formulas (5) and (6), resonant frequencies are defined using L and C parameters.
2) What is the dimension C1 and L1 in formulas (5), (6) and (16), in which the numeric coefficients obtained for the selected values ​​R1 = R2 = Zo = 50 ohms are used?
3) What the values are substituted in formula (16)? Secondly, it does not obvious from where the formula appeared. Please explain the appearance of so high degrees for the values used in (16) (for example, 10^86).
4) Under Formula (16) The authors write that "The capacitance C1 has almostt NO EFFECT ON THE NEGATIVE GROUP DELAY". How can this conclusion be made? There is no confirmation to this statement.
5) The effect of R on τ is analyzed, but again according to which equation?
6) Please explain how do you obtaine the simulation results that are compared with the measured? Also, the theoretical and simulation results -what the difference between them and how they are obtained (formulas simulation tool or etc.)?
7) Probable typos.
   - In tab. 3 and others. C1 is given in pF, and in Table 4 - in the nF.
   - In section 4.1, Tau = 8 ps, and all the other Tau - in the nc.

Author Response

Dear Professor:

Please see the attachment.

Thank you very much for your review,which makes my paper more standardized and perfect.

Author Response File: Author Response.pdf

Round 2

Reviewer 4 Report

The revisions are given for most of the answers. However, there are no comments on the last question 6) in the paper. If you have used a some simulation tool with built-in element models, then you should specify in the paper the tool and element models. If the parasitic parameters of the elements were introduced by you yourself, then you need to specify which parameters. 
Also, in line 178 please specify the number of the formula used "with the results calculated by the equation". 
I believe that appropriate comments should be given in the text.

Author Response

Dear Professor：

Thank you very much for your review. The tool and element models are added and specified in this paper. “In the simulation, the Murata models of capacitor and inductor imported in ADS are used. These capacitor and inductor models include theoretical parameters and parasitic parameters” are added.

In line 178, “equations (2) and (3) “ are added in the “with the results calculated by the equation”.

Thank you again for your review, which makes my paper more standardized.