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Hi Everyone,
I am designing a passive low pass filter using LTspice. I can get a slope of -20 dB/Decade using one pole. Is it possible to get a slope of less than -20 dB/Decade? how do i get a slope of -10 dB/Decade or -6 dB/Decade. is there any way?? can t be done by maybe playing with the...
Hello everyone,
I am designing a Band Gap Reference circuit, all the circuits I can find(eg Brokov Bg reference) give an output voltage of ~1.25 volts(close to the band gap voltage of silicon at 0 Kelvin) , can anyone pls suggest an architecture that gives an output voltage of 3 volts? Thanks...
Thanks Erikl,
Its a heater/resistor..so i dont think linearity is a concern..all i care about is that my circuit should be able to drive the load..
i'll try a current mirror and see if that works..Thanks!
Hi everyone..
I am designing a driver amplifier driving a 100 mW resistive load using CMOS 0.18 um process. can anyone pls give me some tips on the design??
I am thinking of designing a CMOS op-AMP with wide transistors on the output stage - (can I draw 30 mA current from CMOS transistors?? )...
Thanks a lot Keith..
I did that and it seems to work..
btw..1 more question.. the THD on V+ and on V- is high..but that on [(V+) - (V-)] is lower....(LTspice shows a much lower voltage on even order harmonics for [(V+) - (V-)] )...
That's the way it is supposed to be right??
Thanks!
Hi Everyone..
I am trying to get the THD of an amplifier output in LTspice.
I used .four <freq> <signal> spice directive with .tran analysis and I can get the THD of a single ended signal..but i need THD of a differential signal..(LTspice just does not give anything when i try to enter a diff...
btw.. i read from momentum tutorial that MSUB1 should not be used for momentum..it gives inaccurate results..so now i am using a predefined silicon substrate..
@bigboss/Zander_ua: can any of you tell me how to assign a ground to a transformer in ADS momentum?? if i assign port 1 to one end of primary and ground the other end, ie not make a differential circuit, the analysis of equivalent circuit becomes very easy..i'll assign port 2 to one end of...
hi,
I am trying to make a transformer in ADS momentum..
i am using following equations to calculate L and Q of individual inductors
L = imag(1/y(1,1))/(2*pi*f)
Q = imag(y(1,1))/real(y(1,1))
replace y(1,1) by y(2,2) for second inductor
Qustion:(1) does this formula hold true when both...
@jayce and bigboss: thanks guys for your help..i think i got it right now..
i changed layer and substrate definations to cond - copper and MSUB1...and i am getting a Q of about 5..
btw, i am trying to make a transformer now..if i make another inductor on a higher layer, i should be able to do...
hey jayce..sorry for late man..
i saw the conductor defination(strip)... the conductor was defined as perfect conductor -
i changed it to conductor(impedence) and defined the value of impedence as 0.007 ohm per square - is that right?? or should i be using perfect conductor??
thanks
it was 5 GHz ..i'll change it to 10 GHz..
thanks a lot..
btw..can you please tell something about substrate definitions..i think i might be wrong there..thanks..
i computed L from S11 using
y = stoy(s) to get y parameters
and L = imag(1/y11)/(2*pi*f)
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