According to Carson's rule, Bandwidth B and modulating frequency fm are related a a. B = 2(Af + fm) Hz b. B = fm Hz c. B < 2fm Hz d. B > 2fm Hz
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- P3 For the series RLC circuit given in Figure 4 for Vs=10sinot R=2.2 2, L=100 uH and C=1000 uF a) Obtain the resonant frequency and the half-power frequencies. b) Calculate the quality factor and bandwidth. c) Determine the amplitude of the current at 60, 6 and 02. d) Plot the current amplitude versus frequency e) Use LTSPICE to plot frequency response.An RLC series circuit is connected to a 20 V variable frequency supply as shown in Figure 2. Determine the following: O,SAF 202 20mH 20V Figure 2 Resonant frequency in Hertz. (b) Q-factor (c) Lower and upper half power frequencies in Hertz. (d) Bandwidth in Hertz and radians per second. (a)Design (only the block diagram) an Armstrong indirectly FM modulator to generate an FM carrier with a carrier frequency of 98.1MHz and df (frequency deviation) =75kHz.A narrowband FM generator is available at a carrier frequency of 100 KHz and a (frequency deviation) df=10Hz.The stockroom has an oscillator with an adjustable frequency in the range of 10 to 11MHz.There are plenty of Frequency multipliers.
- Can we obtain a plot of XL against frequency f experimentally?BW mssege signai COTier. i) Draw the modulated signal in ii) find the bandwidth of the modulated signal ii) What is phase reversal and we could avoid it? frequency domain, (AM)This approach is a reduced version of the hybrid pi model used almost exclusively for high-frequency analysis. a.re b.T c.hybrid-T d.hybrid
- Frequency bands: What are low and medium frequency bands? What are the difference of the 2 and what are they used for?H.W) What is the central bandpass frequency (fo) expressed in terms of circuit component values. R. Vin L. +c VoutFor the network of figure below, if the mid-band :voltage gain is (-2.47), answer the following .a. Draw the ac equivalant circuit .b. Calculate Ci and Co .d. Determine fHi and fHo .e. determine the cutoff frequency f. Sketch the frequency response for the high- .frequency region using a Bode plot 12 V Cw, = 4 pF Cd - 8 pF Cw = 6 pF C = 12 pF Ca = 3 pF 2.7 k2 10 uF Ipss - 10 mA V --6 V 0.6 k2 10µF Z, R24.7 ka I MQ 0.51 k2 20 uF
- R Vin Vout 1. Find H(w) = Vo/Vi. 2. Derive an expression for the cutoff frequency. 3. Calculate the output voltage at frequencies: 50 Hz, 100 Hz, 150 Hz, 200 Hz, 300 Hz and 1KHZ. Assume Vin=4 v (peak-to-peak), R=1.1 kN and C=1uF. 4. Calculate the cutoff frequency and the output voltage at this value.Q2- Explain by equations and block diagram the direct method demodulation in NBFM Q3- Write the formula of the phase modulation (PM) when Ac=25 , Fc=10® Hz, Kp= 20 . If an information signal m(t) = cos(212000t) + 10sin(2n2000t) Q4- Drive a formula for NBFM by using Bessel function Q5- If an information signal X(t) = cos(2n700t) + 10cos(25000t). Write the formula of the frequency modulation (FM) when Ac=20 , Fc=10® Hz, Kf= n2000 Q6-) If NBFM signal passes through a frequency multiplier. With B < 0.5 and fc=200kHz. Let fm ranges from 50OHZ to 15kHz, and let the maximum frequency deviation Afat the output be 75kHz. Find the required frequency multiplication n and the maximum allowed frequency deviation at the input. Q7- If an angle modulated signal S(t) = 10[cos(210®t) + 15sin(2n10³t)]Problem 3 – Resonance in AC networks [8] The parameters of a series RLC circuit are R = 1 kQ, L = 8 mH and C = 20 pF. The applied voltage is 20 V rms of variable frequency. Determine the following: (a) Resonant frequency. (b) Current at resonance. (c) Q-factor (d) Voltage across the inductor at resonance. (e) Voltage across the capacitor at resonance. (f) Lower and upper half power frequencies. (g) Bandwidth.