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Recent Posts

  • how to solve any problem on translational mechanical system transfer function
  • Problem 1. An NMOS common-source amplifier circuit shown as the figure, the transistor parameters are: VTN=0.8V, Kn = 1mA/V2, and the channel modulation effect is ignored. The circuit parameters are VDD=5V, Rs=1KΩ, RD= 4KΩ, R1=225KΩ, and R2=175KΩ.
    Find the circuit quiescent values IDQ and VDSQ.
    Drawthesmallsignalequivalentcircuit.
    FindthesmallsignalvoltagegainforRLasanopencircuit. 4. Find the input impedance Rin as indicated in the figure.
    Find the output impedance Rout as indicated in the figure.
  • (50 points) This problem has 14 questions. Consider the lossless transmission line given below. Use the attached Smith Chart to find:(a)(2 points) The magnitude I and phase A of the reflection coefficient.
    (b) (2 points) Determine the Standing Wave Ratio (SWR).(c) find the normalized load admittance y and load admittance (d) find the normalized load impedance Zion and the load impedance Zion (e) what is the distance dmin from the load to first voltage minimum indicate on the smith chart the position of voltage minimum.(f) what is the distance dmax from the load to first voltage maximum indicate on the smith chart the position of voltage maximum (g) (4 points) The total voltage on a transmission line is given by: V (2) = Vat e-iP2 + Vi eiBE
    Using I and dmax from previous questions, find the maximum voltage in terms of Vö
    (h) (4 points) Using I and din from previous questions, find the minimum voltage in terms
    of Vot
  • Quiz 1: BIT Amplifier
    Take |VBE|=0.7V, Vr=25mV, p=99. Compute the DC Bias (only IE).
    Draw the small signal model and find the overall voltage gains (vo/vsig).
  • A LTI system is described by
    y(n] = x(n] +2x|n-1] + x[n-2]
    (a) Decide its system impulse response h(n).
    (b) Is this system stable? give reasoning for your answer.
    (c) Decide its frequency response H(elo).
    (9)
    Let the discrete system is defined by input x[m], output y[n] and system
    function h|n]. Answer to the following:
    (a) Using Convolution, find output y[n] for input x[n] = 8(n] + 28[n-1] +
    8[n-2] and h(n] = U(n]. Also Sketch it using stem plot.
    (4)
    (b) Find y[n] in a closed form for x[n]= U(n] and h[n] = a”U[n]
    (assume n≥0 and a]<1). You may use Z transform.
    (4)
    Find the discrete-time system function H(z) that responds to an input
    sequence {1, 0.6; and an output sequence { 4, 2, 1, 1, 1, 1, 1, 1, 1,-
    (here
    _- means all 1s)
    (9)
    4.
    Solve, by Z-transform, for y[n] in a closed form,
    y(n+2] -y[n] -y[n+1]=0, where y[O]=0 and y[1)=1.
    Use Z[y(n+1)]=zY(z) -zy(0) and
    Z[y(n+2) = z?Y(z)-27y(0) – zy(1)

Recent Comments

  1. venkyelectrical on Bonus Problem (10 points): In this circuit, the op amp is IDEAL. The op amp is NOT operating in the linear region. In this Circuit, V+=V_. The op amp output saturates at +12v. The output is always at saturation, either positive or negative. The output will “toggle” as Vin crosses a “threshold” voltage. Because of the positive feedback, the threshold voltage changes depending on the state of the output voltage. Find the lower and upper values of the threshold voltages to 5 places of precision.
  2. venkyelectrical on Problem #3 Operational Amplifiers (35 pts): The op amp is IDEAL and operating in the linear region. Find the voltage gain (Av) of the circuit. If Vin = -2, find io.
  3. venkyelectrical on Problem #2 Operational Amplifiers (35 pts): Op amp is ideal and operating in the linear region. Find the node voltages in the table.
  4. venkyelectrical on Problem #I Linear Amplifiers (40 pts) (SHOW ALL WORK) In the Problem, all resistor values are in ohms, voltages are volts and currents are amps. Amp “A” is voltage-to-current, Amps “B” and “C” are current-to-voltage. Use /1 = 0.01(V1), v2 = 100(/2) and V3 = 50(/3). Use Vin shown in the table. Find all the values listed in the table. Hint: Observe that R3, R4 and R5 are m parallel.
  5. venkyelectrical on 3. This problem is on the quantization and encoding. Answer to the following: Assume round-off rule for uniform quantization. We have 10 samples from the analog signal and their quantization error qε are found to be distributed as, qε =[0.33, 0.36, -0.38, 0.22, -0.4, 0.07, 0.4, -0.18, -0.25, 0.38] (a) Decide the suitable value of quantization step size ∆. Give reasoning for your answer (3) (b) We assume that qε are uniformly distributed with its probability density function f ∆ (∆) =1 /∆ for the interval [-∆/2, +∆/2]. Calculate the quantization noise power Pqε for the value of ∆ you found in part (a). (3) (c) Per the quantization noise power you calculated in part (b), calculate the signal power S [Watt] if output Signal to Q-zation noise power ratio SNRo = 30 dB. (3) (d) If we encode the quantizer output with binary code with length ‘n’(integer), decide the minimum code length ‘n’ based on the condition given in part (c) (1)

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