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thd +ota
Hi,
I designed two Gm-C low-pass biquad filters by using only folded-cascode and telescopic-cascode OTAs for the each biquad.
THD of the telescopic-cascode based filter is much much more than of folded-cascode based filter.
I was expecting telescopic-based would have less THD!
I...
telescopic ota
Hi,
Is it possible to achieve folowings:
a 60dB DC gain,
at least 1 mS Gm
-3dB banwidth of 600 MHz with 100fF load capacitor?
by using classic folded or telescopic cascode OTA and 0.18u technology?
I am trying but my best design has a 27 dB DC gain with 185Mhz bandwith and...
Hi,
I am looking for a tool to calculate low-pass chebyshev filter component values..
There is an online tool on the following address
But this tool calculate the component values automatically. However I need to specify some of the components by myself. For example I want to design a low pass...
Hi,
I am designin a LP 5th order chebyshev filter. I am going implement inductors and resistors using OTAs.
My question is what kind of OTA I should use for that. I mean a two-stage or a folded or somethingelse? How does the OTA type or OTA specs affect the filter? What would be better for an...
chebyshev filter design steps
Hi,
I am trying to design a fifth order lowpass chebyshev filter using gyrators.
I need the transfer function of fifth order passive LP chebyshev filter. I tried to obtain it by myself but got drown in the parameters. Can anyone help me or does anybody know a pdf...
standard spice model units
Hi,
Is there a standard for SPICE parameter units?
I mean TOX is always in angstroms or U0 in cm^2/Vs? Does anybody know a document which gives the units of entire spice parameters? I get confused about the units when I want to use these parameters for...
Hi,
I need umc 0.13 model parameters for hand calculation. I need basic parameters like KN, KP, VT0, tox... I use the umc13mmrf library.
Thanks for help!
ltspice function
problem is solved!
func GDS(Vgs,Vds) {IF (Vgs<=vth, 0.1F, IF(CTRL(Vds,Vgs)>=0,((W*KP/L)*(Vgs-vth-Vds)),(((W*KP)/(2*L))*(Vgs-vth)*(vgs-vth)*lambda)}
There is one missing bracket and a comma instead of point.!
Small Signal Analysis
Hi,
When we try to find the small signal equivalent of a circuit, we apply AC and all the DC power supply nodes(like Vdd and Vss) pretend as if they are ground. At least in text books this is what is taught, but no explanation for that(or I couldn't find). I can't figure...
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