Gain Definition and 417 Threads

Im trying to expand the range of my wifi network, and I am not sure exactly what to expect from a +27 dbi antenna. As I understand it, this will cause the power density to increase by a factor of 2^9. Does that mean the range will increase by a factor of 2^9? or would it be more like...

Hi Gain comptetion in a laser is explained very nicely here...

Hi In almost every book on photonics I've seen, the following expression for the steady state gain is derived 1 + flux/fluxsaturation = gsmall signal/g, where I by flux mean intracavity flux and g is the gain. When talking about lasers, then in the very same books (e.g. Saleh/Teich) the...

Hi, On various websites I read that 70% of the heat loss of a pool is by evaporation, whereas up to 85% of the solar radiation can heat an uncovered pool. We use 22mm thick black color EPE panels to cover our pool. On a sunny day, is it better to cover the pool or to leave it uncovered ...

Homework Statement I recently got a problem that confuses for days, the picture for this problem is in the attachment field, is there someone can tell me that, if an oscillator is topology is described using the negative impedance model in the picture, should I have R>r to ensure that the...

Hi group, I work at Thermal Vacuum Chamber, and we had an incident last night where our chamber, Which is 70' H x 30' D, was pumped down to a pressure of 3.7E-7. There was a release of gas into the chamber abruptly last night that caused the pressure in the chamber to rise to 5.0E-7, before it...

If i know just these 3 values is it possible to implement a circuit using just OP-AMPS, capacitors, and resistors? How would I go about determining what values the capacitors and OP-amps should have? The circuit is a low-pass filter and thus needs to amplify and filter simultaneously.

Hi Here they explain the concept of gain clamping in steady state lasers...

Homework Statement When jogging strenuously, an average runner of mass 68kg and surface area 1.85m^2 produces energy at a rate of up to 1300 W, 80% of which is converted to heat. The jogger radiates heat, but actually absorbs more from the hot air than he radiates away. At such high levels...

Hey guys, I recently had a quiz on Circuit is attached in photo below. T(s) = (A)(s/s+20)*(s/s+200) **All values of R in the circuit attached are 2000 ohms. and C1>C2 a. find the mid-band gain A. I do not know how to start this question... Can anyone give me an idea of where...

I'm studying about photomultipliers right now, but I'm having troubles understanding the concept of gain and secondary emission ratios... 1) Gain : If I were to take a measurement of the output signal produced by photoeletrons and relate it the the high voltage of the PMT, I'd expect a linear...

hello, I have a strange problem! I wanted to amplify my signal and i used 2op amps, each of them has a feedback resistor between (-) pin and output( pin 2 and 6 in 741) the ratio of resistors(r2/r1) is 150, but my signal only amplify 5times! I change the R2 resistor but nothing changed! i put...

why?

If a photon has no mass, why does it have momentum? How is it calculated?

For the Matlab bode diagram, normally when we want to obtain the gain margin, we have to cross the line from phase -180 and touch the curve. (Picture1 is what I did) however from the matlab, the gain margin crossover is start from -540 instead of -180 degree by using "Margin" function(Picture2...

Using op-amps, which have a gain x bandwidth constant of 500,000, design the following circuits. Include circuit diagrams, the appropriate theory and details of how you calculated the values of all the components used.(i) An inverting amplifier with a gain of 500, having an input impedance of...

Homework Statement A study of weight gain in male rats compared two diets, A and B, which were formulated in terms of level and source of protein. A total of twenty two rats were randomly assigned to the diets, eleven to each diet. Summary statistics for the weight gains (grams) by the...

I've been trying to look around for projects to do in C++ to gain programming experience but I can't really find any. Can anyone here suggest any programming projects a non-expert in C++ can do? Or would working through this class be a good way to start...

As previously stated in other threads, I have started to work on a summer assignment for my Fall semester EE course. I was given a circuit and asked to derive an expression for the gain (Attachment 1). I have not yet started to write out the problem on paper, but have two thoughts as to where I...

As previously stated in another thread, I have started to work on a summer assignment for my Fall semester EE course. I was given a circuit with an op amp and asked to determine the transfer function and gain. This problem I have completed (not sure if I'm correct) based off of notes from an EE...

I have started working on a summer assignment for my Fall semester EE course and was given a gain problem with an op amp (Problem shown below - EE P3.1). My professor also gave me, what he calls, 'Typical Homework Solutions.' I have based most of my work with the example problem he gave...

Homework Statement A 100 Newton force lifts a 5 kilogram object 2 metres. When the force is removed, the object continues to move upwards. Calculate: (a) the work done by the force; (b) the gain in gravitational potential energy (using g = 9.5n/kg); (c) the gain in kinetic energy...

Hi everyone, I need to find the voltage gain for the following scheme: My book says I need to calculate 'id' first, which is: id = gm.ro.vin/(Rs+RL+ro+(gm.ro.Rs)) Then with the help of vout = -RL.id you get: Av = -gm.ro.RL/(Rs+RL+ro+(gm.ro.Rs)) So I get the last part, but I really have...

Hello. This technically isn't homework, however I am studying for an upcoming final. I feel like I must be missing something. I'm trying to calculate the phase margin of a system so my first step is to find the gain crossover frequency (GCF). Homework Statement Transfer function: H =...

current gain of an op amp? Homework Statement need to convert current(output of a detector) in the range of pico amps to voltage between 1-5V Homework Equations (to connect to an adc) The Attempt at a Solution I've connected an op amp(for current...

If the base current of an NPN transistor is increased, what will happen to its Collector current since I still don't understand how a transistor amplifies signals or about the current gain. (i.e. Ic/Ib)

I am trying to setup a circuit with an op-amp that is referenced to high rather than ground and has a positive gain less than one. So for instance, my circuite has power rails at ground and 3.3v. I want an input of 3.3v to give an output of 3.3v and i want an input of 0 to give an output of...

Does a charge gain energy in every [inertial] frame when it is accelerated? If you start with one inertial frame, and then you accelerate a charge from that inertial frame to another one, it appears that we produced a changing electric field in making that occur. Isn't the changing electric...

In Fig. 9-64, block A (mass 1.1 kg) slides into block B (mass 2.9 kg), along a frictionless surface. The directions of velocities before and after the collision are indicated; the corresponding speeds are vAi = 5.6 m/s, vBi = 2.2 m/s, and vBf = 4.9 m/s. What is velocity vAf (including sign...

I have been drawing a few bode diagram by hand and i am ask to find the phase and gain margin of the plot. Can someone please explain what are phase and gain margin, including how to determine it from the bode plot?

Maybe I'm old-fashioned or stuck up or something, but this really bothers me, and it seems to be a growing trend that people gain weight and become flabby as they get older. To me this seems so disrespectful to your partner. A man or woman was attracted to you based on how you looked when...

Does a PNA show FFT If I'm looking at gain across a band on a PNA could one say that I'm looking at an FFT or is that complete nonsense?

Homework Statement What is the gain of this Op-AMP. Express symbolically (Eg. in terms of R1, R2..) http://img195.imageshack.us/img195/3389/opampproblem.png Uploaded with ImageShack.us Homework Equations KVL/KCL The Attempt at a Solution i1=i2 Vx (the voltage at the...

I see more and more that any professor or REU program wants one of three skills: programming (which I am in the process of obtaining), fabrication/machining/welding(which I know very well), or electronics knowledge, the latter which I do not have and have no idea even where to start. I know...

Homework Statement This isn't an assignment per se but rather a thought exercise proposed by a professor during class. The scenario is that you have a room where an internal combustion engine is used to run a machine. You have no information about the machines power output or efficiency...

How to you calculate the gain in a current mode filter (of any current mode circuit in general) For a voltage filter you have G= Vout/vin Do you also use the Current gain (G=Iout/Iin) to simulate the behavior of a current mode filter or should you convert the currents to voltages and...

Homework Statement You enter a game with a $100 bet that involves flipping coins. The coin has probability p that heads will come up, probability (1-p) that tails will come up. Now, if you are rewarded $10 for every heads, but lose $10 for every tails. You decide to quit if you lose or...

1. You have a series circuit consisting of a ac power supply, a 600 ohm resistor and a 73 nF capacitor. If the circuit is configured as a low pass filter, what frequency will cause the gain to be 0.25? 2. If the circuit is configured as a high pass filter, what frequency will cause the gain...

Homework Statement I have attached the graph, and questions. Homework Equations The Attempt at a Solution For part a, do I just have to estimate how many db's are lost during one octave? One octave is halving of frequency, so could part a be approximated to be about 8...

Does proton diameter increase with the addition of energy, such as thermal energy? I guess this is also to ask if a particle's rest mass can increase. And, if a proton can gain rest mass, does the diameter correlate with it?

Homework Statement The Effective Isotropic Radiated Power of an antenna is 60dBm. If the gain of the antenna is 30dB what is the input power to the antenna? (a) 3W (b) 2W (c) 4W (d) 5W Homework Equations EIRP = Power x Gain (in watts) EIRP = Power + gain (in dbm) The...

We don't see matter rushing to a center point as though down a drain anywhere in the universe. Black holes' accumulation of matter must (except perhaps rare moments like a collision with another black hole) happen over a long period of time. Assuming a star, destined to be a black hole, began...

Homework Statement Construct a low-pass filter and measure the gain (Vin/Vout) for a range of frequencies 20 Hz to 10 kHz using an oscilloscope. Plot your data along with the theoretical curve. Use a semi-log graph. What is the half power point for this filter? Does it match the theoretical...

"For low power transistors (under 1 W), the current gain is typically 100 to 300. High power transistors (over 1 W) usually have current gain of 20 to 100." — Electronic principles by Malvino I want to understand why the current gain is high for low power transistors and why it is low for...

I am lean by nature and an avid cyclist at that. I noticed that any food I eat gets put to work during my extended spinning session. I would like to gain some more muscle in my leg area to give me more power during hill climbing and accelaration in a race. I don't know what kind of muscles I...

Not particually a paradox, just liked the word play. Anyway... The definition of a redox reaction is a reaction with both reduction and oxidation. As we know, oxidation is loss, reduction is gain of electrons. So redox is a reaction with both loss and gain of reaction. Does it follow that...

Ive read on loads on places that tell me this but don't explain why. They explain the closed loop gain drops off because the open loop gain in their 'real' equations is no longer infinite/very high so the assumpstions that lead to ideal equations fail. but nowhere can I find an explanation...

You could gain a lot of weight and still have very little body fat! Of course, you'd need to do it for a very long period of time (for the D2O to replace all the H2O in your body). But would there be health risks? haha.

Is there good list of common units (good as in including the unit, symbol, and quantity it measures) anywhere out there? I did some searching and came up with this, but I'm unsure how good it is as a source. http://www.alcyone.com/max/reference/physics/units.html Any supplementary list or...

Pass these tests, gain admittance to MIT ** http://libraries.mit.edu/archives/exhibits/exam/algebra.html ** Only for those alive in 1869.