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Type: Posts; User: Junus2012

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1. ## Thread: indivisual out different from differential output in fully differential amplifier

by Junus2012
Replies
4
Views
267

### Closed: Re: indivisual out different from differential output in fully differential amplifier

Dear friends,

these result are from simulation
and it is targeted for the sample and hold circuit

if I want to calculate the settling time do i need to calculate it for the single ended of...
2. ## Thread: indivisual out different from differential output in fully differential amplifier

by Junus2012
Replies
4
Views
267

### Closed: indivisual out different from differential output in fully differential amplifier

Hello,

attached is the transient pic of the fully differential amplifier I have designed,

if you look to the vo+ and vo- you will see the sparks on it, however the differential coltage is...
3. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Thsnk you Suta,

I mean ideal switches
4. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,

I have two questions,

1. I have designed my OTA with continuous time CMFB circuit, will it be a problem or it is only optional to design SC CMFB ?
2. Are...
5. ## Thread: Wide swing cascode mirror with variable input current

by Junus2012
Replies
5
Views
428

### Closed: Re: Wide swing cascode mirror with variable input current

Thank you Suta,

Sure now one must consider the small signal behavioural, like the bandwidth of the circuit since the added cap will load the op-amp, therefore, I have selected the minimum cap...
6. ## Thread: Wide swing cascode mirror with variable input current

by Junus2012
Replies
5
Views
428

### Closed: Re: Wide swing cascode mirror with variable input current

Dear Suta,

I found the solution for this, that is the only way is to bias the diode transistor with a current that track the input change, one...
7. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,

I have simulated with longer time, as you expected the signals are becoming true after a while and looking fine as shown below157161

157162

Now this issue is being cleared,
Now...
8. ## Thread: CMFB biasing current in fully differential Opamp with adaptive current source

by Junus2012
Replies
0
Views
200

### Closed: CMFB biasing current in fully differential Opamp with adaptive current source

Hello,

I am trying to apply an adaptive biasing technique to source the differential pair of the fully differential amplifier, the adaptive biasing source a current of let say Ib under small...
9. ## Thread: Wide swing cascode mirror with variable input current

by Junus2012
Replies
5
Views
428

### Closed: Wide swing cascode mirror with variable input current

Hello,

Below is the normal wide swing mirror,

157130

I have swept the value of Iin and kept the current in the diode biasing constant as normal as we do for biasing the mirror in operational...
10. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Thanks klaus, you are right, I was confused cause in my simulation with out a resistor it was C1_fb/C1_in, but now as you explained it becomes impedance relationship
11. ## Thread: Fully differential opamp is inverting or non inverting amplifier ?

by Junus2012
Replies
5
Views
534

### Closed: Re: Fully differential opamp is inverting or non inverting amplifier ?

Thank you friends

I just wanted to follow the standard, Gray and Jakob they refer to it as inverting ampliifer, other authors deal with it as a non inverting amplifier,
any way as Suta...
12. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,
Attached below is the setup according your last suggestion, again the output is missing the symetry arounf VCM. by the way I have noticed with this configuration...
13. ## Thread: Fully differential opamp is inverting or non inverting amplifier ?

by Junus2012
Replies
5
Views
534

### Closed: Fully differential opamp is inverting or non inverting amplifier ?

Hello,

attached the picture of the fully differential closed loop feedback, which one of the configuration should be the standard one ? many authors refer to config 1 and mostly to config 2, while...
14. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,

That is exactly what I have seen in this paper,

https://ieeexplore.ieee.org/document/8805570

with this setup the circuit is working as expected with gain is equal to unity
...
15. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

I put the 100 MOhm as you suggested , I made the simulation time for 1ms, see the result please

157097

157098
16. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,

I will try your suggestion by tomorrow

thanks alot for your nice help
17. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,

I think now you put your hand on the right investigation,

I connected a big resistor in parallel to the C1 (at the input side only), the result was vrey degraded, I changed the value...
18. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,

1. The DC biasing of the common mode input signals is set by the balun, so I am applying a differential input pulse signals with a common mode voltage...
19. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,

Here is the circuit with the result, as you see that is strangely the outputs are not intersecting in the middle. This is not the case when I apply a sin signal instead of the pulse...
20. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear Suta,
Thank you very much for your explanation,

I have a question about the Ceff, first when you tried to find b (the feedback factor) you have treated the capacitor as a resistor in series...
21. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Re: Simulating the slew rate with capacitive feedback fully differential amplifier

Dear freebird,

that was nice explanation,

my load is 10 PF, so according to the circuit in the graph is c2= 10 PF. but I don"t know how much should I use for C1,...
22. ## Thread: Simulating the slew rate with capacitive feedback fully differential amplifier

by Junus2012
Replies
27
Views
1,772

### Closed: Simulating the slew rate with capacitive feedback fully differential amplifier

Hello,

I am simulating the slew rate of fully differential OTA. I have a problem with making buffer using resistive network, first I can't choose small value of R because this will kill the gain...
23. ## Thread: nedding help to setup pole zero analyses in cadence

by Junus2012
Replies
3
Views
439

### Closed: Re: nedding help to setup pole zero analyses in cadence

Dear Pancho,

I tried spectre -h pz in the command interface but giving me this error "undefined function - spectre"
24. ## Thread: Including geometric variation of transistors using Montecarlo simulation in Cadence

by Junus2012
Replies
3
Views
621

### Closed: Including geometric variation of transistors using Montecarlo simulation in Cadence

Hello friends,

I read couple of papers in which the author performed a montecarlo based on geometric (dimention) variations. How can I define such setup ? is there any setting for that ?

for...
25. ## Thread: nedding help to setup pole zero analyses in cadence

by Junus2012
Replies
3
Views
439

### Closed: nedding help to setup pole zero analyses in cadence

hello,

I am trying to use pole zero anayses (PZ) using ADE spectra to locate the poles and zero of my single ended amplifier, but I think I am missing the correct setting, if there is any tutroial...
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