Recent content by dalarev

I recently obtained my BSEE and have been accepted into a PhD program at a Texas university. This program is BS to PhD, which I suppose means I won't be obtaining a Masters. Anyway, I have become rather strongly attached to working in the medical field. As far as I know, this potential...

One of the conditions for oscillation is that the (regenerative) feedback loop must provide a 180 degree phase shift. This is due to the fact that, for a regenerative effect, the signal must undergo n*360 degrees phase shift: 180 from the amplifier and another 180 from the feedback network...

For sure, make sure you're comfortable with this concept. Also, you should understand that through all of your circuit, there is only one current. This means that, from V=I*R, your current would be: I = E / (R1+R2) ; From that equation, it is immediately apparent that the values of...

Good point; that would rid my need for the RF choke at the source at the very least. I've been trying to break this oscillator up into functional parts. I'd like to isolate the negative resistance generator portion of the circuit, which I'm assuming is everything except the series L+C3, and...

50 Ohm load is the equivalent circuit of a "port" in the simulator I'm using; also, this port must be used for power measurements. I have seen several schematics with a secondary buffer stage for that reason, perhaps I can implement that later. 2.4 GHz. No transmission lines in this...

More specifically, I have an NMOS oscillator, where the output is taken from the source terminal. I have to couple the output (50 Ohm load) with a coupling capacitor, but is this going to affect my calculations of the resonant frequency of the circuit? In my case, I have a Clapp oscillator...

Voltage drop across the "equivalent" resistance, meaning the resistance shown by the 2 resistances in parallel, equals 5V. V = I*R => R = V/I R = 5V/2mA = 2,500 OhmsNow this R is the equivalent resistance R_eq, which can be found by: 1/R_eq = 1/R1 + 1/R2 or after rearranging...

Wow, that's pretty cool. Good idea, I should probably explore some of these simpler circuits in the simulator. So am I correct in thinking this C1 in your diagram is equivalent to the C1 + C2 series capacitances in my circuit? Thanks a bunch for your input.

This concept isn't immediately clear to me. I have textbooks and the internets at my disposal, what topic would you recommend I review to help me understand this?

More clearly, what is the tuned circuit in this case? I have an oscillating frequency condition which must be satisfied for the whole characteristic equation, which is a function of the inductor and all three capacitors. What's not clear to me is if the other "tuned" circuit, the branch...

If from the tuned circuit you're excluding the capacitor in parallel with the resistor, then I can see how the rest is in series, yes. I say this because of what happens at the junction of both capacitors: ...or a variable capacitor in series with the inductor? Thank you for...

First thing I noticed was your input/output in reversed order to how I was looking at it, but that's what you're referring to when you say "this would then act as the input", right? If I'm going to do it the textbook way, in which I find the loopgain as the product of the open-loop gain *...

So I have this VCO for which I'm trying to calculate the characteristic equation for, vo/vi. Image of this and the small circuit equivalent attached. I've also attached a simpler (in my opinion) common-source small signal equivalent to express that representation of the output, for instance...

Ahhh, hahaha, yes. My mistake; those parameters are only default values because I put together a schematic quickly just to be able to take a screenshot of it, to show the layout. Though, in practice, both of my static capacitors do have values of 1 pF. My DC bias is not shown, but the NMOS...

Are you referring to the absence of transmission lines? They will be implemented in the design, but I fail to see other apparent inconsistencies with it. My goal is to create subcircuits of the tank circuit/negative resistance generator separately, then use an oscillator probe available in...