THA Problem 5: 2011 Using a capacitive humidity sensor whose transfer function is given by C=C(1-α);where a % is relative humidity (~ ε,.). - - Cco = Cc |α-0% = 1μF 1- Design a conditioning circuit to measure the relative humidity a=[0-100]%. 2- Draw the frequency response.

i know b and d is true, idk about the rest

Sketch a phasor diagram showing Vin, Vout, Vr, Vc. What would be the phase shift for a dc input, and very high frequency input?

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)]