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  • Electrical Engineering Archive: Questions from 2023-12-7

    Find the minimum output capacitance, COUT, so that the domino circuit will work correctly for all input combinations. Assume the following: All intermediate node capacitances, Cp = 0.4pF, VDD = 5V. For the static inverter, Vth = 3V.

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    For the diode circuit shown, what is the output voltage, Vo, in millivolts? Assume that 11 = 15xI2, and the junction area of D2 is 20x as as large as the junction area for D1. Use Vt = kt/q = 26 mV. (Hint: You don't need to know the values for Vcc, I1, I2 or for Is1, Is2. All you need to solve this problem is the ratios given!)

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    Given VDD = 1.2 V, CL = 100 fF, and fCLK = 1.5 GHz, KN = 100 uA/V2, and VTn = 0.5 V. (Ignore channel length modulation factor) i) Draw the transistor schematic for implementing logic function F = A+BCD using static CMOS gate. ii) Size the transistors for worst-case pull-up and pull-down with respect to the following inverter shown in the figure below. iii) Compute the activity coefficient for both the output transitions (0 to 1 and 1 to 0) using a truth table. iv) Calculate the expected power dissipation. v) For the CMOS base combination circuit design in ii) determine the best case Tp(90% - 10%) using average current model.

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    The diode has a turn-on voltage of 0.8 V. The resistors are R1 = 2.9 kohm and R2 = 1.9 kohm. Find the diode voltage, VD. Round off your result to two decimal places.

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    Consider the amplifier shown in Figure 1. The MOSFET operates in its saturation region and is characterized by the parameters VT and K. The input voltage vI comprises the sum of a DC bias voltage VI and a sinusoid of the form vi = Asinωt. Assume that A is very small compared to VI. Let the output voltage vO comprise a DC bias term VO and a small-signal response term vo. a) Determine the output operating point voltage VO for the input bias of VI. b) Determine the small signal gain of the amplifier. c) Draw the form of the input and output voltages as a function of time, clearly showing the DC and time-varying small-signal components.

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    Consider the circuit shown. VZ = 4 V. Assume the diode is OFF. Determine the current, I, shown on the circuit diagram. Enter your answer in mA rounded to two decimal places.

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    Size the transistors in the circuit below so that it has the same drive strength, in the worst case, as an inverter that has PW = 5 and NW = 3. Use the smallest widths possible to achieve this ratio. Write down the size next to each transistor

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    Diode DC Analysis: for the following circuit, determine the voltage across the output, Vo. Diode D1 is a different type than diodes D2 and D3. Here are the Is factors for each diode. Diode D1: Is1 = 1×10-13 A Diode D2/D3: Is2 = Is3 = 6×10-13 A

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    Determine the exact output voltage waveform for the following circuit and indicate when the diode is forward and reversed-biased (use the second approximation for the diodes D1 and D2 with 0.7v of voltage drop, and assume D3 as an ideal diode).

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    Find the Q-points for the diodes in the circuit using (a) the ideal diode model (Von = 0) and (b) the constant voltage drop model with Von = 0.75 V. The Q-point of a diode consists of its voltage and current values.

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    VDD = 15 V μnCoxW/L = 2 mA/V2 Threshold voltage, VT = 1 RD = 1 kΩ RG = 2 kΩ RL = 10 kΩ C1 = C2 = ∞ (a) VGS = (b) Assuming VGS = 5.5 V, what is the transconductance gm mA/V

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    Determine the output voltage and diode currents for the circuit shown in Figure 1, for two values of input voltage. Assume the circuit parameters are R1 = 5.0 kΩ, R2 = 10.0 kΩ, VD = 0.7 V, V+ = +5.0 V, V- = -5.0 V, Determine vo, ID1, and ID2 for 1)VI = 0, and 2) VI = 4.0 V

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    For the diode circuit of Figure, E1 = 24 V, E2 = 12 V, R1 = 270 Ω, R2 = 470 Ω, R3 = 330 Ω and R4 = 100 Ω are given. (VD1 = 0.7 V, VD2 = 0.3 V) Determine: a) the currents ID1, I1and I2, b) the voltages V1 and V0.

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    Find the Q-points for the diodes in the four circuits in Fig. P3.69 using (a) the ideal diode model and (b) the constant voltage drop model with Von = 0.75 V.

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    The above logic circuit is composed of two cascaded MOSFET circuits. The circuit has inputs A and B, and output C. A) Which logic gate (NOT, AND, NAND, OR, NOR, XOR) best describes the function between inputs A and B and output C in the above circuit? Select only one logic gate. B) Based on the above MOSFET circuit, if inputs A = 1 and B = 1, what is output C?

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