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Type: Posts; User: promach

1. Thread: Round-Robin Arbiter Architecture from Efficient microarchitecture for network-on-chip

by promach
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1
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164

Closed: Round-Robin Arbiter Architecture from Efficient microarchitecture for network-on-chip

I have formally verified a round-robin arbiter code

Could anyone advise about the various methods of minimizing the combinational delay tcomb penalty mentioned at the end of section 2.3 of...
2. Thread: Derivation of basis function for M-ary PAM baseband PAM signal set

by promach
Replies
0
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58

Closed: Derivation of basis function for M-ary PAM baseband PAM signal set

Do anyone have any idea why Am = 2m-1-M ?

http://i.imgur.com/iKxm2N8.png
3. Thread: Slide 0951 of the book : Analog Design Essentials

by promach
Replies
0
Views
142

Closed: Slide 0951 of the book : Analog Design Essentials

I am reading the book Analog Design Essentials

However, the attached slide 0951 on the book pdf is so unclear.

Could anyone upload the same slide with higher sampling resolution ? Thanks !!!
...
4. Thread: Understanding Linear implementation of a round-robin arbiter

by promach
Replies
3
Views
377

Closed: Re: Understanding Linear implementation of a round-robin arbiter

What is the actual purpose of the chain of fixed-priority cells F in figure 2.3 ?

How does this chain actually help to eliminate the circular loop logic as described in the paper itself ?
...
5. Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
807

Closed: Re: Determine whether a binary number is of power of two in verilog code

20 = 1

So, in could have the value of 1

Note: I am trying to detect one-hot as mentioned in post #1
6. Thread: Understanding Linear implementation of a round-robin arbiter

by promach
Replies
3
Views
377

Closed: Re: Understanding Linear implementation of a round-robin arbiter

@std_match

What is wrong with my verilog code implementation that resulted in wrong waveform result ?

https://i.stack.imgur.com/uGFct.png

module arbiter2 #(parameter WIDTH = 4) (clk,...
7. Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
807

Closed: Re: Determine whether a binary number is of power of two in verilog code

The following will also work, with less LUTs and higher fmax compared to the solution above.

always @(*) is_power_of_two = ((in + in + in + in + in + in + in +...
8. Thread: Understanding Linear implementation of a round-robin arbiter

by promach
Replies
3
Views
377

Closed: Understanding Linear implementation of a round-robin arbiter

For Efficient microarchitecture for network-on-chip routers , do anyone know how this round-robin arbiter actually works ?

Note: The corresponding verilog codes seem to be located at...
9. Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
807

Closed: Re: Determine whether a binary number is of power of two in verilog code

The solution is to use

always @(*) f = (v != 0) && ((v & (v - 1)) == 0);

Someone suggested me to use power_of_two = ^v which is so much simpler.

Any comment ?
10. Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
807

Closed: Re: Determine whether a binary number is of power of two in verilog code

See the verilator linting output with is_power_of_two.v

verilator -Wall --lint-only is_power_of_two.v
%Warning-WIDTH: is_power_of_two.v:6: Logical Operator LOGAND expects 1 bit on the LHS, but...
11. Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
807

Closed: Determine whether a binary number is of power of two in verilog code

I am trying to determine whether a binary number is of power of two (in other words, is it of one-hot encoding).

I found a method to do so, but it is for integer.

Could anyone help to transform...
12. Thread: Derivation of Marchand Balun equations

by promach
Replies
2
Views
311

Closed: Re: Derivation of Marchand Balun equations

Analysis and design of impedance-transforming planar Marchand baluns talks about the derivation process, but it is still not complete.

We still need to derive equation (1) of the paper.
13. Thread: HFSS port 'Port1' does not have a valid reference plane above or below it.

by promach
Replies
62
Views
4,977

Closed: Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

See https://github.com/promach/planar_marchand_balun

I suppose I made mistake in the width of the coupled microstrip (W=2mm) in terms of ports impedance of 50 ohm ??
...
14. Thread: Derivation of Marchand Balun equations

by promach
Replies
2
Views
311

Closed: Derivation of Marchand Balun equations

Could anyone advise about derivation of Marchand Balun Equations ?

Note: Screenshot below is taken from paper :

New Design Formulas for Impedance-Transforming 3-dB Marchand Baluns

...
15. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

Could you post the ADS linecalc window screenshot which shows 120° ?
16. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

Someone else told me the above.

What do you think ?
17. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

Is it possible to prove this mathematically using some microstrip expressions ?
18. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

I am trying to understand why open-circuited stub has a better S21 response compared to stepped impedance according to the result at figure 5.4 below:

this microstrip equation for Zo does not...
19. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

See https://github.com/promach/low_pass_filter

By the way, what is the difference between open-circuited stub and stepped-impedance ?

See 2GHz Microstrip Low Pass Filter Design with...
20. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

I have added a polygon covering the entire box region at the GROUND layer.

However, I am not sure if I have actually added a ground metal plane.
I could not see the ground plane using 3D viewer...
21. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

I have inserted the feedline as shown in the figure below. May I know how to generate a DXF layout file (without the extra feedline structure) for actual manufacturing purpose ?

By the way, is...
22. Thread: Deriving admittance matrix for shortened quarter-wavelength transmission line

by promach
Replies
2
Views
405

Closed: Re: Deriving admittance matrix for shortened quarter-wavelength transmission line

For equation (1) , I am trying to use MATLAB y2abcd() function to convert admittance matrix to ABCD matrix.

However, I am getting mismatch between MATLAB answer and actual theoretical result.
...
23. Thread: Deriving admittance matrix for shortened quarter-wavelength transmission line

by promach
Replies
2
Views
405

Closed: Deriving admittance matrix for shortened quarter-wavelength transmission line

For Reduced-size branch-line and rat-race hybrids for uniplanar MMIC's , how to derive equation (2) ?

and is the imaginary constant j needed in equation (1) ?

https://i.imgur.com/Y32GkzC.png
...
24. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

What do you exactly mean by reference plane shift ?
25. Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,155

Closed: Re: microstrip low pass filter design issues with sonnet

Someone told me the above with regards to the two extra rectangles nearest to the ports.

What do you guys think ?

What about in HFSS ?
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