Recent content by jeffy

Homework Statement i have the equation x(y+z)=f some how it becomes x(z xor y xor zy) Homework Equations The Attempt at a Solution xy+xz xy(z+NOTz)+x(y+NOTy)z x(yz+(y XOR z)) Thanks

Hi, I want to calculate the amplitude of the following: V(t) = Acos(2wt)+Bcos(3wt)+Ccos(4wt)+Dcos(5wt) Not really sure what approach I can take to do this. I was thinking of using some combination of the double angle formula to simplify each part, but I don't think that will necessarily...

regarding your last comment, my impression that taking the envelope of the function was for the purpose of simplifying a complicated curve, which therefore, should be similar to the original representation. it seems that (lets say that the q axis is frequency), that if we only really care...

hmm ok, but i guess my question is really more related to modelling a function with an envelope function... lets say i found the transfer function of the envelope, would that be close enough to model the original wave such that i could fully describe the original wave? thanks again for the help

let's say i am to find the envelope of a sinusoidal wave. would the envelope be the peak of the sinusoid or the bottom? would you not lose some information about your sinusoid in that case? does all the envelope function do is model a simplified version of the original wave?

Hi, can anyone explain to me what the purpose of finding the envelope function is? I understand graphically that it is a function that is tangent to another curve or another set of curves, but what purpose does it serve? If we just had one curve, and we found the envelope function, why...

Hi, I have a 8th order s-domain transfer function that i would like to normalize for plotting a bode plot. The transfer function is in expanded form i.e. s^8 +s^7+s^6 etc. i want to normalise the frequency f by frequency f0 such that s = j(f/f0) instead of just s = j2πf. the reason i...

ya but is the set up correct, because 139.24cm^-3 is low comaring to 1.18E18cm^-3, but then again they are minority carriers

Homework Statement A semiconductor p-n junction is fabricated where the doping concentration on the p and n sides of the junction is Na=1E18cm^-3 and Nd=1E16cm^-3 respectively. Given that ni=1.18E10cm^-3, T=300k calculate: a) The majority and minority carrier concentrations in the...

Its works Thanks for your help

Thanks for the reply This is how i calculated P (lambda-AI)=(-1,1) 1 1 = -1 -1 -1 = 1 addded (1) to (2) to get (2)' 1 1 = -1 0 0 = 0 therefore P1+P2=-1 P1= -P2-1 P=[ -1-P2,P2] setting P2 to zero i get (-1,0)

Homework Statement dx/dt= -4x -y dy/dt= x-2y x(0)=4 y(0)=1 x(t)=? y(t)=? Homework Equations The Attempt at a Solution 1) find eigenvalues (x+4)(X+2)+1 X=-3,-3 2)eigenvectors: (-3-A)(x,y)=(0,0) eignvector=(-1,1) 3)using the P from this page...

thanks for the reply im sorry to bother you but in a previous question the authour short circuited an independent voltage source in a circuit with both dependent and independent sources when finding the thevenin resistance of the circuit, do you mind explaining why they shorted the independent...

Homework Statement Hi, I had a question about how my textbook finds the thevenin resistance (Rth) for this question I have already solved the thevenin voltage(3V) and I have a question about finding the Rth In the solution using a test current source of 1 A and I have been taught...