Recent content by ENGRstudent

Bump. OK, someone here simply *must* know the answer to this.

Will the impedance characteristics for a length of stranded conductor be really close to an equivalent length of single core conductor? For example, can you expect the same impedance from a 20 ft. run of 12 AWG single core as you would from a 20 ft. run of 20 AWG stranded conductor? I know...

Thanks for taking the time to look over the problem. Where did you get -128.5 from? I just worked it again and found an error in my last step, and the new value I got for the gain is 40.56 dB. I have attached my work as a PDF to make it more clear. Please review it to see where I may...

I think I've done this right, but I'm looking for some reassurance because I often make stupid mistakes when converting from dB to watts and back again. Thank you in advance! I'm about to graduate in 2 weeks, and this forum has been AWESOME throughout my college career. Kudos to everyone who...

Thank you. I went with the 1/4 wave transmission line since there doesn't seem to be a cut and dry method to do it otherwise without knowing a frequency.

I'm afraid our professor didn't cover how to use Smith Charts, but I think I remember what a resonant circuit is. However, we weren't given a frequency, so I don't know how I would go about choosing either L or C components.

How would I select the size for the L's and C's if I were to use those? What would these networks look like? Thank you for your help.

Our professor gave us some homework and one of the problem statements reads: "Design an impedance matching network used to connect a 300 Ohm transmission line to a 50 Ohm transmission line." Is this as simple as Zmatch = Sqrt(Z1*Z2) ? I'm wondering if there's something I'm missing...

This is correct, Paul. Except our professor is having us use (1-1/CMRR) instead of (1+1/CMRR). I'll have to try to find out why that is different... Essentially, it's the same answer as before with the ideal op-amp model but with the CMRR coefficient in front. Thanks again for your help!

Yes, CMRR stands for Common Mode Rejection Ratio. I wish I could fill you in more as to how it impacts the analysis, but I'm still not very sure myself. I did some looking on the internet and found a couple of decent source of explanation, but I'm still not sure how to apply it to this...

Well Paul, it looks like I still need some help :). I tried analyzing the circuit writing 3 KCL equations (1 for the node between R1 & R2, 1 for the node between R2 & R3, and 1 at the node between R3 & R4), and I was able to get the same answer as you. I was happy with that. Then I went and...

I think I'm starting to see. Thank you, Paul. I understand how you came about your derivations; I still think I have more to learn about how to evaluate op-amp circuits. This assignment isn't for a grade, it's just to give us some practice work. I will speak with my instructor tomorrow to...

OK, I think I need to take a step back and look at this from a broader viewpoint. Could you please explain how you derived your expression for Vout in your first post? I'm having trouble seeing how you came up with your equations, and I'm not sure which currents from which branches you've...

Replace "with respect to" with "due to the signal from" in my last post. It's just a different way of saying it. I don't see how setting V2 = 0 would make the current through R4 and R3 = 0 also. There is still a voltage in the circuit from V1 and a current that must still travel to ground...

I ran the circuit again in MultiSim, and I've found that Vout is only 0 if all the circuit elements are equal, i.e., V1 = V2, R1 = R2 = R3 = R4. If you change these values, Vout changes accordingly. Berkeman, could you explain to me how this might be correct or incorrect? I am not challenging...