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As more and more components are placed on a single integrated circuit (chip), the amount of heat that is dissipated continues to increase. However, this increase is limited by the maximum allowable chip operating temperature, which is approximately 75°C. To maximize heat dissipation, it is proposed that a 4 X 4 array of copper pin fins be metallurgically joined to the outer surface of a square chip that is 12.7 mm on a side.
(a) Sketch the equivalent thermal circuit for the pin-chip-board assembly, assuming one-dimensional, steady-state conditions and negligible contact resistance between the pins and the chip. In variable form, label appropriate resistances, temperatures, and heat rates.
(b) For the conditions prescribed in Problem 3.27, what is the maximum rate at which heat can be dissipated in the chip when the pins are in place? That is, what is the value of qc for Tc = 75°C? The pin diameter and length are Dp = 1.5 mm and Lp = 15 mm.
Gratings are often written into photoresist by interference (superposition) of optical beams. In other words, the standing wave formed by the overlap of multiple plane waves produces a (useful) exposure pattern.
a) Draw a cascade or parallel form for the block diagram representation of the system b) Determine the possible ROC's of this system. For each case determine causality and stability of the system.
How long would it take to complete a read operation in a MT48LC32M16A2 with a 120 MHz clock and a value of 002AH in the mode register
The number of turns in primary and secondary of an ideal transformer are N1 = 50 turns and N2 = 400 turns. The primary winding is connected to a 120 - V, 60 Hz source with a source resistance of 50 Ω. The secondary winding is connected to a 1600 ..
Design a circuit to supply a -2.5 reference voltage as the input to a voltage follower if only 9 V batteries are available. Use an In4740 diode, which has a Zener voltage of 10 v at a current of 25 mA.
Will the electric field inside change (how much if yes)? Will the stored energy in the capacitor change (how much if yes)?
Calculate the minimum PWM frequency for a small permanent magnet DC motor with a time constant of 15 milliseconds.
Sketch the equivalent circuit and phasor diagram for the no-load conditions and, assuming operation is in the step down mode, determine (a)the exciting current; (b)the core loss component of the exciting current; (c)the magnetizing current; (d)the..
Discuss why it is important to understand how interpret data from op amp datasheets. How might this skill be used when designing op amp circuits.
Create a sequence detector that recognizes the following sequence on input X with overlap: "1011101", and sets the output Y to 1 when the sequence has been detected. a) Provide the state diagram and truth table showing the previous state
K map explanation for mod 5 up synchronous counter?
Determine formulas in closed form for the marginal probability distribution function of X for all x, and sketch a graph of this function over the range -1 ≤ x ≤ 2.
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