Diode High Frequency

Help with physics (electronics) please?

I have been studying electronics in physics and am having alot of trouble. I have a list of questions here that I am need answers to. Please feel free to answer which ever ones u want (you don't have to answer all of them) but it would be appreciated.

1) How do you find the inductance and capacitance of a circuit if you are given the resistence, EMF voltage, the frequency of the EMF and graphs of voltaged vs time.

2) Is the R/L constant dependant on the frequency of the EMF

3) How do you change the ripple voltage of a diode bridge? (I think this one is just add a capacitor but I'm unsure)

4) How do I read the specification sheet for a integrated circuit. For a 74LS08 AND gate i need to find a) how long it takes to go from low ot high b) what is the RC constant c) why are the answers for part a and b different

Any help would be appreciated.
Thanks.
In question 4 I meant the difference between the 2 in part a.

I studied electronics theory for a long time, here's what I can do for you......

1) The graphs are needed if the EMF is D.C. voltage (then it starts to get complicated explaining a DC charge circuit for inductors/capacitors)

Use the following formulas to find the missing variable for EMF of A.C. voltage. Algebra is a must here.

XL= 2 times (pi) times f times L : Xc=1/[ 2 times(pi) times f times C ]

XL is inductive resistance (in ohms) Xc is capacitive resistance (in ohms)
f = the frequency of the A.C. power into the circuit (in Hertz)
L = the inductance of the inductor (in Henry's)
C = the capacitance of the capacitor (in Farads) - should be a very small #
pi = 3.14159

2) No. The R/L constant is used for D.C. charging. D.C. voltage doesn't have a frequency.

3) You have one of the correct answers here. Adding a capacitor will change the voltage by reducing the rippling effect to a higher constant.
The other answer is the change the configuration of the diodes (using fewer). This will also - CHANGE - the voltage since you can configure it to a half-wave or full-wave by re-orientating the diode configuration. Your teacher/instructor may make the argument that it's not a bridge circuit anymore. OK I could see that - BUT what if one (or more) of your diodes frys out due to current overload ?? - This is basic troubleshooting.......... I've seen it before in the field, doesn't happen often because engineers "usually" take this into consideration in the design.

4) I'm not familiar with the 74LS08 AND gate. This is a question that an engineer can help you with, I deal in the real world.
IC chips come in a wide variety due to the number of different suppliers of the parts. What is good enough for one manufacturer may not be good enough for another. That's why they have spec sheets (if your employer actually bothers to keep them around - the right ones, I mean)
Another point that's good to keep in mind is: that specs on the same IC chip can change even if they come from the same manufacturer. I can't even remember how many of those little buggers that I spent the afternoon changing out because of a bad/underrated batch that got sent to our company, because of somebody at QC.

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operation of pin diode at very high frequency?

A pin diode is typically used as an RF switch. Normally diodes are made of P-N junctions. They only conduct in one direction of course but in reverse bias (off) mode they look like a capacitor and can pass high frequency signals quite easily. The P and N regions are separated by a very very thin depletion region with no mobile conductors (insulator) so the capacitance is high.

The P-I-N diode separates the P and N regions with an undoped intrinsic region (the I in P-I-N). When the diode is forward bias, it looks like a normal diode and can conduct either a DC signal or a very small ac signal riding on a dc signal. When the P-I-N diode is reverse biased, the same kind of capacitor forms as before BUT now there is a thicker depletion region formed because the intrinsic region becomes part of the insulator in the capacitor.

The net is, when a P-I-N diode is compared to a normal P-N diode, in the forward biased mode, it will conduct small a.c. just as well as a normal diode bit when it's reverse biased, it looks like a very high impedance (small capacitor). It makes a great solid state RF switch.

http://en.wikipedia.org/wiki/PIN_diode