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A Si sample with 10^16/cm^3 donors is optically excited such that10^19/cm^3 electron-hole pairs are generated per second uniformlyin the sample. the laser causes the sample to heat up to 450K. find the quasi-fermi levels and the change in conductivity of the sampleupon shining the light. electron and hole life times are both 10us. Dp(diffusivity of holes)= 12cm^2/s Dn(diffusivity ofelectrons)= 36cm^2/s ni=10^14 cm^-3 at 450K. what is the change inconductivity upon shining light.
consider a simple thermostat controller with three inputs and twooutputs. the inputs consist of two user-operated swutches(A,W) and one temperature sensonr T. T=1and T=0 mean the actualroom temp is above and below the desired value, respectively.
The design specifications for a simple inverting amplifier require an input resistance of 10kOhm and a voltage gain, A=-6.2 a) prepare a design using an ideal OpAmp b)If a real OpAmp with the properties: Ri=2MOhm, A=200k, Ro=75Ohm
The delay is an integral multiple of slot time. The numberof slot times to delay before the nth retransmission attempt ischosen as a uniformly distributed random integer r in the range0
A ball of radius 1 meter centered at the origin has uniformly distributed over its volume a positive charge Q. a. In moving a positive test charge from the point (x, y, z)= (2, 2, 2) to the point (4, 4, 4), do you have to do work on the test charge..
The phase margin needs to be at least 45 degrees. The error for a ramp input should be less than 5% Add the lag compensator using bode plots. Show the characteristics (margins) of uncompensated and compensated system to
You are required to determine that this next generation transmission system will require a spectral efficiency of 5 bits/sec per Hertz.
A half wave dipole antenna is operating in air at a frequency of 100 MHz. At a distance of 1000 km and at an observation point ? = ?/2, electric field strength is measured to be 5 µV/m. Calculate the a. Length of the antenna
a square wave of 1000Hz is introduced into an ideal band passfilter (bandwidth = 100Hz) that is tuned to 5000Hz. The signal output has an amplitude of 0.1V. The filster is thenreturned to 9000Hz.
Design an inverting op-amp circuit for which the gain is -5V/V and the total resistance used is 120kΩ
Can we build a bandpass filter using a low pass and a high pass filter combination. If your answer is yes, then how should the cut off frequencies be arranged. Illustrate your answer with a simple example.
An Alternator is found to have its terminal voltage on load condition more than that on no load. What is the nature of the load connected
use GPS and they are useful for many reasons. GPS receivers use signals from more than three satellites so that cheap quartz clocks can be used instead of expensive atomic clocks. The quartz clocks tend to drift up to + or -1 ns/s.
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