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18 Threads found on Cv Curve
can any one tell me hw to plot CV curve of a simple nmos using cadence? means hw to go abt.?
You can't modify the varactor CV curve, but the overall circuit circuit characteristic. You need to redesign the tuning circuit so the varactor is directly coupled to the LC circuit and recalculate the LC values to cover the domain. You may try to minimize the voltage on the VCO LC tank so the AC voltage on the varactor is much lower than 1V and i
I did In CADENCE. I swept the gate voltage and shorted the Drain, Source and Bulk terminal to GND. I did the DC analysis. Now I want to plot the CV curve. But I don't know how to do it?? Please can anybody tell me the way how to do it in CADENCE??? Is it ok to do it in DC analysis? I think the capacitor's val
Bias the MOSFET use DC voltage source as you want, remember to insert a large inductor between the DC voltage source and your drain, gate, source etc. After this, connect a 1V AC source to the gate, perform a AC simulation on the frequency range you care, then plot out the current flow through this AC voltage source, since the AC voltage is 1V, the
Connect in series 2 DC sources: One of them has Vdc=Vgate Vac=0 Another Vdc=0 Vac=1m Use AC analysis and change Vg as sweeping parameter. Then plot C= Ig/(2*Pi*Freq*Vgs) vs. Vgate. You will get CV curve. I did that several times in Cadence. It works fine. There is another method using transient with fixed frequency.
u can plot the capacitance , by using s parameter simulation or ac simaltiuon just sweep the control voltage and get the input impedance , the imaginary part is equal 1/(2*pi*f*c) u know f then u can get C or in hspice manual there is anonther way to polt Cv curve of search there khouly
i know maybe it is convinent to simulate by using ads and i want to know how to do that in hspice, to simulate varactor is it by using "LX" ?
the tuning range of the VCO depends on the CV curve of the varactor , so to get high tuning range u need the vacattor to have wide tuning volateg khouly
Hi, I tried to build a veriloga model for varactor and the code is listed below. I used a math equation to fit the CV curve from the foundry (from -1.8V to 1.8V). But when I did the ac simulation to double check the value in the equation, I got two different CV curve. Could someone help me? Thanks! ===================== module CVAR_S
Hi folks. I am designing a broadband micro strip patch antenna in ADS (resonant freuency fr: 10GHz) . I have the narrow band resonating structure ready with me and now I would like to broadband it by connecting var actor diode near the edges. I would like to know how to stimulate a varactor diode in ADS. I have made the circuit as in the attach
Hi Guys, How can I measure Vth of an NMOS in a lab? I had read that I can plot the square root of the drain current vs. gate voltage (Vg) and then take the intercept of the line on the Vg axis. Can the CV curve also be used to measure Vth? Also how is Leff (channel length) and width measured? Thanks.
Look at Fig. 4.4. (C-V characteristic of a poly/n-well MOSCAP) in the PDF below. The deep depletion region is the range in the depletion region, where the low frequency CV curve is at (or close to) its minimum, or - in short form - the center part of the depletion region. At the min. value of the CV curve (in the cente
Hi, I plot the CV curve in following way with AC analysis. Initiate the ac analyis at one frequency and vary the control voltage. Plot the CV curve of MOS varactor (e.g at 1GHz) using the following formula. (-1 / (2 * pi * 1000000000 * imag(VF("/out")))) See the circuit diagram attached with the msg. 100H ideal inductor is there to
There are a number of solutions; You can extract a CV curve using ATLAS and sweeping the voltage and defining the steps. You could then consider plotting 1/C^2 vs voltage to extract the threshold voltage. Alternatively both ATLAS and ATHENA allow you to extract the VT voltage directly, which you could also conduct for comparison. Finally, I assume
I think the spec is kind of strange, since I=Q/t, mA/hours is a wrong unit they already told you Q=CV, Q=I*T dV=I*dT/C
The CV characteristics of 2 RVT & LVT varactors are just offset by the difference of their Vt voltages.
Dr Ayman , I also tried alot to get training in analog design and i've failed , I'm graduate from El shorouk academy , Electronics and communications , and i read many books in EE ,like art of electronics , Razafi's books , and really I'm dissapointed with no chances in training us , would you like to let us have training? [color=#99999
I'm trying to understand the differences/similarities between the Exponential curve that represents a controlled change in Frequency and the Logarithmic curve that represents a controlled change in Volume. My understanding is that the human ear responds to changes in Frequency in an Exponential manner. e.g. In Voltage-Controlled synths using the