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An AM signal is written as xc(t) = Ac (1+ µx(t))cos(2pi*fc*t) where fc is the carrier frequency, Ac is the carrier amplitude, µ is the modulation index, and x(t) is the baseband message signal. We assume that x(t) has absolute bandwidth W << fc, and that its amplitude has been normalized so that |x(t)| <= 1. If x(t) is a cosine of amplitude 1 and frequency fm << fc: 2)
• Obtain an expression for the amplitude spectrum X c(f) of the AM signal xc(t).
• Determine the power in the carrier and in the sidebands. Express the powers in units of dBm into a 50 ohm load. (Remember that the spectrum analyzer input impedance is 50 ohm) 3)Obtain numerical values in Item 2 if fm = 15 kHz, µ = 1/2, and the carrier amplitude and frequency are Ac = 1 and fc = 300 kHz 4)Repeat Item 2 for a message x(t) which is a square wave of amplitude 1, zero dc level, 50% duty cycle, and fundamental frequency fm 5)Obtain numerical values in Item 4 if fm = 15 kHz, µ = 1/2, and the carrier amplitude and frequency are Ac = 1 and fc = 300 kHz.
the output voltage of battery drop from 6V .With no load to 5.2V with a load current of 400mA. calculate the internal resistance.
Finding appropriate source for the electrical load, Have four circuits. One takes 9Vdc, two 5Vdc, and last one takes 12Vdc. Have variable transformer for source. How do I calculate or choose the voltage needed to run all four circuits with out blo..
Consider the financial aspects of the digital thermometer project. The project cost is estimated at $10,000. The total manufacturing cost of the digital thermometer, as called for in the specifications, total $150(that is, $95 parts
computation with 5% of the code that cannot be paralleled, compute the speedup and efficiency.
A radar transmits a monotone pulse of 5-s duration. Suppose the radar were redesigned so that the same pulse envelope is frequency modulated with linear FM over 100 MHz. (a) What is the possible new range resolution
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Compare this spectral distribution with that of the radiation received on the surface of the earth at AM1.5. Briefly explain the causes of the difference between the emitted radiation of the core of the sun and the received radiation at the earth'..
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A class C amplifier severely distorts the signal. How can we use a resonant tuned filter to get the desired signal at the output What type of transistor (BJT or FET) would you like to use at the front end (first amplifier) of a receiver
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