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Type: Posts; User: pancho_hideboo

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1. ## Thread: Diagonalization of Impedance Matrix

by pancho_hideboo
Replies
8
Views
688

### Closed: Re: Diagonalization of Impedance Matrix

Thanks for very good example.

Why is a diagonalization impossible in this frequency ?
What does this frequency mean?
This frequency is twice of 3-dB cutoff frequency.
2. ## Thread: What is the cutoff frequency of the capacitively loaded Transmission line

by pancho_hideboo
Replies
7
Views
119

### Closed: Re: What is the cutoff frequency of the capacitively loaded Transmission line

What quantity do you see in simulation ?
3. ## Thread: What is the cutoff frequency of the capacitively loaded Transmission line

by pancho_hideboo
Replies
7
Views
119

### Closed: Re: What is the cutoff frequency of the capacitively loaded Transmission line

So large mismatch at port, although I don't know what you set for "mtline".
What quantity do you see in simulation ?
4. ## Thread: What is the effect of power match on S11 and S22 in a PA

by pancho_hideboo
Replies
1
Views
94

### Closed: Re: What is the effect of power match on S11 and S22 in a PA

What do you want to mean by "good" ?

What do you want to mean ?

What do you want to mean by "good" ?

Wrong.

Can you understand operation class of PA ?
There are many operation class for...
5. ## Thread: What is the cutoff frequency of the capacitively loaded Transmission line

by pancho_hideboo
Replies
7
Views
119

### Closed: Re: What is the cutoff frequency of the capacitively loaded Transmission line

Generally wrong, although I don't know what book you read.

Your circuit is well-known capacitive discontinuity in uniform line.

What value do you set for reference impedance of ports ?
6. ## Thread: Problem in saving data during DC sweep simulation in Cadence Virtuoso

by pancho_hideboo
Replies
10
Views
710

### Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

OCEAN is not required.
OCEAN is no more than an assistant of generating netlist.

Excecute simulation from netlist directly as same as HSPICE.

Modifying netlist manually.
You can never utilize...
7. ## Thread: Simulating the input capacitance of digital instance

by pancho_hideboo
Replies
10
Views
523

### Closed: Re: Simulating the input capacitance of digital instance

Use PSS/PAC with clock instead of AC.
8. ## Thread: Simulating the input capacitance of digital instance

by pancho_hideboo
Replies
10
Views
523

### Closed: Re: Simulating the input capacitance of digital instance

Assume rectangular pulse as clock.
Cin is different for low level, high level, rising edge and falling edge.

What Cin do you want to evaluate ?

Average Cin over one period of clock ?
Or...
9. ## Thread: Simulating the input capacitance of digital instance

by pancho_hideboo
Replies
10
Views
523

### Closed: Re: Simulating the input capacitance of digital instance

Transient signal has no meaning in AC analysis.

I assume you use Cadence Spectre.

If you would like to evaluate AC capacitance at specific time point, use transient analysis with setting...
10. ## Thread: Simulating the input capacitance of digital instance

by pancho_hideboo
Replies
10
Views
523

### Closed: Re: Simulating the input capacitance of digital instance

I don’t think a method using transient analysis is required.
11. ## Thread: Simulating the input capacitance of digital instance

by pancho_hideboo
Replies
10
Views
523

### Closed: Re: Simulating the input capacitance of digital instance

Simply do AC analysis.
12. ## Thread: Problem in saving data during DC sweep simulation in Cadence Virtuoso

by pancho_hideboo
Replies
10
Views
710

### Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

I don't think so.

So multiple sweep simulation speed is very slow compared to Spectre's native sweep ability.

See "spectre -h...
13. ## Thread: Diagonalization of Impedance Matrix

by pancho_hideboo
Replies
8
Views
688

### Closed: Re: Diagonalization of Impedance Matrix

[P, D] = eig(Z)

(Case-1)
Z = [1, j; j, 1]
Z : Symmetric=1
Z : Hermitian=0
Z : Skew-Hermitian=0
Z : Orthogonal=0
Z : Unitary=0
14. ## Thread: Dynamic Comparator noise using spectre transient noise analysis

by pancho_hideboo
Replies
1
Views
138

### Closed: Re: Dynamic Comparator noise using spectre transient noise analysis

Use time domain noise analysis of PSS/Pnoise.
Then integrate noise spectrum over 0-fs/2.
Here you have to set a decision time.
15. ## Thread: How to find cutoff frequency of the circuits

by pancho_hideboo
Replies
3
Views
303

### Closed: Re: How to find cutoff frequency of the circuits

Simply calculate voltage transfer function.
Then evaluate cutoff frequency by symbolic math tool such as Mathematica, Maple, Maxima, Symbolic Math Toolbox in MATLAB, etc.

Or use SapWin....
16. ## Thread: Diagonalization of Impedance Matrix

by pancho_hideboo
Replies
8
Views
688

### Closed: Re: Diagonalization of Impedance Matrix

Z = [2, j, 0;
j, 2, j*2;
0, j*2, 2]

This [Z] is neither Hermitian, Skew-Hermitian nor Unitary, yet it is Symmetric and Normal.
This [Z] can be diagonalized by Orthogonal...
17. ## Thread: Diagonalization of Impedance Matrix

by pancho_hideboo
Replies
8
Views
688

### Closed: Re: Diagonalization of Impedance Matrix

Not useful at all.
18. ## Thread: Diagonalization of Impedance Matrix

by pancho_hideboo
Replies
8
Views
688

### Closed: Re: Diagonalization of Impedance Matrix

I know such very basic thing.

No. [Z] is not a Hermitian matrix.

Here [Z]T means transpose of [Z], [Z]+ means conjugate transpose of [Z].

For lossless reciprocal circuit, [Z] is a pure...
19. ## Thread: how to get higher P1dB,in point

by pancho_hideboo
Replies
2
Views
251

### Closed: Re: how to get higher P1dB,in point

High bias current and low load impedance.

by pancho_hideboo
Replies
9
Views
674

### Closed: Re: Loadpull for Differential PA

Can you understand differential circuit ?

No. There is no coupling between L.
Can you understand actual transformer ?

Ideal transformer is not...
21. ## Thread: Problem in saving data during DC sweep simulation in Cadence Virtuoso

by pancho_hideboo
Replies
10
Views
710

### Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

Show me netlist when you invoke parametric sweep.
22. ## Thread: Problem in saving data during DC sweep simulation in Cadence Virtuoso

by pancho_hideboo
Replies
10
Views
710

### Closed: Re: Problem in saving data during DC sweep simulation in Cadence Virtuoso

DC Analysis is not required.

Or enclose ac analysis statement by sweep statement in netlist.
23. ## Thread: Diagonalization of Impedance Matrix

by pancho_hideboo
Replies
8
Views
688

### Closed: Diagonalization of Impedance Matrix

Generally an impedance matrix [Z] is a complex symmetrical matrix.
It is neither a real symmetrical matrix nor a Hermitian matrix.

However a complex impedance matrix [Z] can be diagonalized.
I...
24. ## Thread: Too large .psf file generated by Post layout simulation using Spectre

by pancho_hideboo
Replies
1
Views
222

### Closed: Re: Too large .psf file generated by Post layout simulation using Spectre

I can not understand what you want to mean at all.
Describe correctly.

Show me netlist.
Here I don’t require circuit description.