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Re: Concept of Ground
Actuallly the only thing that matters are potential differences or voltage differences between 2 points. So a ground is only used as a reference.
For example when you say that a certain point is at 2V, it means that that point in your circuit is 2V above your reference...
Re: Help!! What is the max value of "on chip" capa
uF capacitors seem big to me.
I already used a 0.35u process and several pF capacitors are in some circumstances feasible, allowable.
But uF capacitors? I think they should be external. Or maybe a redesign of your system can make the...
Well, the ultimate goal in using the switched amplifier is to obtain a higher powerefficiency than the currently used class AB amplifiers in the xDSL central offices.
You can certainly describe this power amplifier as a class D power amplifier driven by an "asynchronous" sigma delta modulator...
steven de bock xdsl
Hello,
I finished my master thesis. Therefore, I'd like to share my "extended abstract" on EDA board as some people might to review it. If any of you has some comments, feel free to share them with me.
My thesis is about a switched amplifier, using an asynchronous...
mosfet cox
Hi,
If you are using the BSIM3v3 model, than you can use u0 as u. I noticed that u0 isn't defined in your model, so you can use the default values of u0.
For a NMOS: u0 = 670 cm^2/(V*s)
For a PMOS: u0 = 250 cm^2/(V*s)
u0 is defined as the Low-field surface mobility at 'tnom'. So...
Clearly there is some interest in this kind of amplifier, since I received the following query in my mailbox:
-----------------------------
Enquiry: Comparator: preamplifier, decision, postamplification
Do you have the layout for this circuit.
You would be helping me a great deal.
Also what...
Did you make sure if your transistors are in their correct region (saturation, triode or whatever you were designing for)?
I think it would be much easier for people to answer your question if you provided us with a schematic.
channel length modulation
It's true, deviations from experiments aren't very accurate. Although lambda is a very common parameter for equations in gain estimation of an opAmp. So lambda does have a practical meaning.
If you have a better idea and more accurate means to determine small signal...
channel length modulation, lambda
What I did for determining lambda is to determine the slope of the IDvsVDS curve of the transistor in saturation. Now, draw a line through a point of the IDvsVDS curve with the determined slope and determine the intersection with the ID = 0 curve. This results...
Ok, thank you!
But could you explain to me why increasing the length would improve propagation speed? Far as far as I know increasing length, only increases parasitic capacitances.
Can you give me an idea why you state that I should chose my length, 10 times the minimal length?
Thanks I...
Re: ASIC design
mmm, interesting...
I really have no experience in the field, but the first topic that came to my mind is:
the monitoring of combustion in engines.
Maybe another interesting viewpoint is the pollution by the production of ICs themselves that could be questioned. Rather...
I'm not sure, but if I remember correctly from the last time I used NEC about 2 years ago, the wavelength was calculated by inserting the frequency into a special field in your NEC gui. Using this wavelength you can calculate the size of your half wave antenna. Then you can draw a wire with this...
Re: basic questions
Bias voltages are used to bias a transistor into it's correct point of operation. This point of operation determines your small signal parameters, for example gm of a mosfet.
Small signal parameters are used to linearize the operation of your device around it's point of...
Re: fabrication
The big difference is that both are totally different technologies.
Both can use similar process steps like lithography, spin-coating, etching techniques... Although the order in wich these process steps are applied, the duration of baking processes, materials used... can...
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