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A 10-cm high and 20-cm wide circuit board houses on its surface 100 closely spaced chips, each generating heat at a rate of 0.08 W and transferring it by convection to the surrounding air at 40°C. Heat transfer from the back surface of the board is negligible. If the convection heat transfer coefficient on the surface of the board is 10 W/m2 ?c °C and radiation heat transfer is negligible, the average surface temperature of the chips is
(a) 80°C
(b) 54°C
(c) 41°C
(d) 72°C
(e) 60°C
Consider the BJT differential amplifier when fed with a common-mode voltage VCM . As is often the case, the supply voltage VCC may not be pure dc but might include a ripple component vr of small amplitude and a frequency of 120 Hz.
Choose the best answer for what a DC blocking or coupling capacitor does, assume the capacitor value is chosen to be too small. Blocks the DC and is relatively high impedance to the AC voltage. Blocks only the AC voltage going ..
A silicon abrupt junction in thermal equilibrium at T=300 K is doped such that Ec-Ef=0.21 eV in the n region and Ef-Ev=0.18eV in the p region. (a) draw the energy band diagram of the pn junction.
Consider a 16-ary PSK system with symbol error probability PE = 10-5. A Gray code is used for the symbol to bit assignment. What is the approximate bit error probability
Filament 1 is on the left, filament 2 is in the middle, and filament 3 is on the right. Filaments 1 and 2 have currents of 1 A in the ba z direction, and filament 3 has a current of 2 A in the ba z direction
The average power is not necessarily equal to the average current times the average voltage. To show this, find a voltage waveform and current waveform where each has a zero average value but their product has a non-zero value.
If the voltage across a capacitor is a square wave, predict the resulting current waveform (draw the voltage and current waveforms). Repeat the process when the voltage across the capacitor is a sine wave.
Light Traveling an optical fiber (n=1.44) reaches the end of the fiber and exists into air. Answer the following questions: a. if the angle of incidence on the end of the fiber is 25 degress, what is the angle of refraction outside the fiber
The Ic was measured for different values of a load resistance. It was noticed that Ic was pretty much constant for the first 1900 ohms values, but then it suddenly decreased. Why did that happen
A circular capacitor of radius r is made using SiO2 as the dielectric on a silicon wafer. If a trench of depth l is made to replace the circular capacitor with the trench capacitor with trench depth l, find the ratio of the two capacitances.
a current source of 12 cos 2000t a a 200-ohm resistor and a 0.2-h inductor are in parallel. assume steady-state
Two resistances R1 and R2 are connected in series. We know that R1=60 ohms and that the voltage across R2 is three times the value of the voltage across R1. Determine the value of R2.
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