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Unformatted text preview: Escuti/Masnari 2007 ECE200 Fall 2007 Homework 7 Periodic Signals In Frequency Domain, Amplifiers Page 1 of 5 Problem 1: [16 pts total, 8 part a, 4 part b, 4 part c] a) Draw the magnitude, phase, and power spectra (using both W and dBW scales) of the following signal. (This means four plots.) b) Find the total signal power. Hint: the total power can always be found as the sum of the powers in the power spectrum (in units of Watts). c) Find the RMS value of this signal. Hint: this is easily calculated from the answer to the previous question. Problem 2: [8 pts] Given the power spectrum shown below, construct an equation for the signal v ( t ) (i.e. in the time domain). Assume = 0 for all peaks. Hint: note that there will be five terms in the expression. Problem 3: [10 pts] An amplifier with a voltage gain of 1500 is used to amplify the electrical signals generated by a microphone. The amplified signal is fed to an 4 audio speaker. (a) Assuming that the input signal generated by a microphone has an RMS voltage of 10 mV, find the average (real) power of the music delivered to the speaker (the output). Hint: note that this calculation involves the speaker resistance!...
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