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a. Above what frequency will the radiated emission of Problem 12.6 begin to fall off as a result of the loop no longer being small?
b. What will be the slope of the fall off?
Problem 12.6
A PCB trace 4 in long and spaced 0.062 in from the return conductor is carrying a 10-MHz, 3.18-ns rise time clock signal. Assume the current in the loop is 50 mA.
a. Determine the radiated field strength in dB μV/m at the fundamental frequency, when measured at a distance of 3 m from the board.
b. Plot the envelope of the radiated emission from 10 to 350 MHz.
c. What is the worst-case margin against the FCC Class B limit, and at what frequency does it occur?
What degree of matching in emitter area is required for the base-emitter voltages of two bipolar devices with identical collector currents to have a difference of less than 5.0mV Use VT= 25.85mV.
Find the values of I and V for the circuits assuming diode are ideal. Consider Vin=0,2,6, and 10V. Also plot V vs. Vin for Vin ranging from -10V to +10V
All the script needs to do is make a two 10 by 10 grids, one for the user, one for the computer. Allow the user to choose where to place their ships, and in which direction. Then have the computer randomly place its ships.
A Bandpass Filter, made up of a High pass RC circuit to a Low Pass RC circuit has values of R1=R2=10.0 kohm and C1=C2=0.01uF is created. Varying the driving frequency from 10Hz to 1MHz in decades and measure Vout and the phase angle.
Three capacitors are found that each have an impedance of -j2.0, and they are connected in parallel with the load in a wye configuration. Determine the power factor of the combined load as seen by the source.
Two transistors, fabricated with the same technology but having different junction areas, when operated at a base emitter voltage of 0.75V, have collector currents of 0.2mA and 5mA. A. Find Is for each device.
A 3-element uniform linear array with inter-element spacing of λ/2 is operated as a broadside array ,find the directions of null radiation , find the direction and the relative level of the side lobe .
The input/output relation of a discrete time system is given by y(n) = x(n+1) + x(n-3). Find an expression for h(n), the unit sample response of this system. specify how many non-zero terms there are in h(n).
Questions 1. Describe what is meant by the voltage gain of an amplifier 2, What is the primary purpose of a coupling capacitor ub transistor amplifiers?
What refractive index and what thickness do you need to make aquarter-wave anti-reflection coating between air and silicon at10GHz At λ0= 10μm Assume undoped silicon with losses negligible.
For the purposes of the plot you may as well take the speed c, the height of the triangle at time 0, and the half width of the base all equal to 1. Make your plots for lots of times ranging from t = -4 to 4.
Compare the result with that of a cascode stage for a given bias current (IC1) and explain why this is generally not a good idea.
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