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A typical 50,000 watt AM broadcast transmitter will generally have severallow power audio amplifier stages, a high power (~25,000 watt) audiooutput stage to generate the audio power that modulates the RFcarrier, low power RF stages to generate the carrier signal, and avery high power RF amplifier to generate the unmodulated RFcarrier. Discuss the applicability of various amplifierclasses to two or more of these applications. Why might oneclass of amplifier or the other be the best choice for each circuit?
How do the short length and medium length transmission line models differ and why Draw the equivalent circuit of a medium-length transmission line
A control system is needed to control a small shopping center parking lot lighting system and the exterior lighting for the building. The design specifications require that the parking lot lighting and the exterior lighting turn on at dusk automat..
Find the Thevenin and Norton equivalent circuits for the circuit. Find the maximum power that this circuit can deliver to a load if the load can have any complex impedance. Repeat if the load must be purely resistive.
in the bottom of the 9th inning, the bases are loaded and the braves are down by three runs. chipper johns steps to the plate. twice he swings and misses. The crowd heads for the exits. the next pitch is a fast ball down the middle.
A DSP engineer applies DFT to 500 data samples that are sampled at 250 Hz to plot the signal spectrum. What is the frequency that corresponds to the frequency bin number
The doping level of N-type semiconductor is Nd= 5^19 cm^-3. Determine the room tempature position of the Fermi level ( with respect to the bottom of the comduction band) if the semiconductor is A). Si (Nc=2.86^19cm^-3)
Suppose a radio frequency signal is sampled at fs = 500 MHz. What frequency bands from 250 MHz to 1000 MHz will alias into the FM band, 88-108 MHz
Two strands of infinitely long current rights carry currents of equal magnitude. Find the magnetic field produced by the two filaments at the midpoint between the two strands. Compare this result if the currents: a) have the same direction
Power factor correction, Three parallel impedances in rectangular form as follows
Given a coaxial cable with solid inner conductor of radius a, an outer conductor that goes from radius b to c (so c>b>a), a charge +Q that is assumed evenly distributed throughout a meter length of the inner conductor
A silicon (ni= 10^10 cm^-3) p-n junction diode has a maximum electric field of -10^6 V/cm and a depletion layer width of 1 um. The acceptor density in the p-type region is four times larger than the donor density in the n-type region.
Suppose that OFDM is used with 15 kHz subchannels. (Two subchannels are used as guard channels on either side of the band.) Specify an OFDM symbol rate and modulation format for each subchannel that can achieve the target rate.
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