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Type: Posts; User: promach

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1. ## Thread: Understanding Linear implementation of a round-robin arbiter

by promach
Replies
3
Views
314

### 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 ?
...
2. ## Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
654

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

20 = 1

So, in[0] could have the value of 1

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

by promach
Replies
3
Views
314

### 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,...
4. ## Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
654

### 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[7] + in[6] + in[5] + in[4] + in[3] + in[2] + in[1] +...
5. ## Thread: Understanding Linear implementation of a round-robin arbiter

by promach
Replies
3
Views
314

### 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...
6. ## Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
654

### 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 ?
7. ## Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
654

### 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...
8. ## Thread: Determine whether a binary number is of power of two in verilog code

by promach
Replies
14
Views
654

### 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...
9. ## Thread: Derivation of Marchand Balun equations

by promach
Replies
2
Views
292

### 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.
10. ## Thread: HFSS port 'Port1' does not have a valid reference plane above or below it.

by promach
Replies
62
Views
4,685

### 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 ??
...
11. ## Thread: Derivation of Marchand Balun equations

by promach
Replies
2
Views
292

### Closed: Derivation of Marchand Balun equations

Note: Screenshot below is taken from paper :

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

...
12. ## Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,082

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

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

by promach
Replies
37
Views
2,082

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

Someone else told me the above.

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

by promach
Replies
37
Views
2,082

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

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

by promach
Replies
37
Views
2,082

### 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...
16. ## Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,082

### 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...
17. ## Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,082

### 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...
18. ## Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,082

### 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...

by promach
Replies
2
Views
393

### 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.
...

by promach
Replies
2
Views
393

### 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
...
21. ## Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,082

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

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

by promach
Replies
37
Views
2,082

### 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 ?

23. ## Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,082

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

Why does Z0 of a microstrip line depends on W but not L ?

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

by promach
Replies
37
Views
2,082

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

I know, but do you notice the two extra rectangles (which do not have any designated length and width dimensions) nearest to the ports ?

https://i.imgur.com/n422Rvv.png
25. ## Thread: microstrip low pass filter design issues with sonnet

by promach
Replies
37
Views
2,082

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

For the two ports (which are allocated two rectangle patches), I know I can use PCB calculator, but how do I decide the input and output impedance of the microstrip transmission line ?

Is VNA...
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