• Electrical Engineering Archive: Questions from 2024-01-14

    Let’s consider a static CMOS inverter. The two transistors have fixed Ln = Lp. The equivalent unit resistance of the PMOS (that is, with Wp/Lp = 1 ) is twice as large as that of the NMOS. The drain capacitances per unit W of the PMOS and NMOS are equal. Calculate the ratio Wp/Wn, that makes the propagation delays tpLH and tpHL equal to each other.
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    Example 7: The transistor parameters for the common-source circuit in Figure below are VTH = -0.4 V, (W/L)P = 50, λN = 0.02 V-1 , λP = 0.04 V-1 , kn’ = 100 µA/V2, and kp’ = 40 µA/V2 and ID = 0.5 mA. a) Determine (W/L)N such that the small-signal voltage gain is Av = Vout /Vin = -40. b) What is the required value of VB ? c) What is the value of VGS?
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    For the following amplifier, derive the small-signal voltage transfer function, vout/vin, with consideration of parasitic capacitances by using the MOSFET small signal model. Ignore the channel modulation effect and the bulk effect.
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    a) Using small signal model of transistor including output resistance and body effect, calculate voltage gain (Vo/Vin) for three amplifiers shown in Fig.2. Assume the following small signal parameters for both NMOS and PMOS devices: gm = 1mS, ro = 20 kΩ and gmb = 0.2 gm. [2pt.] b) Assuming the dc voltage of node Vx is half of supply voltage (Vdd = 5 V) and transistors need 0.1 V headroom to operate in active region, plot output waveform when Vin = 2.5 + 0.2 Sin(ωt) applied to the input. [3 pt.] (i) (ii) (iii) Fig. 2
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    In a digital circuit, supply voltage is logic 1; Ground voltage is logic 0. Fill in the blanks, choose from lower, 1, 0, supply, upper, ground, high. Pay attention to upper case and lower case. You must use the same case as provided. PMOS transistor is ON when input to gate is a type your answer... voltage or logic type your answer... , NMOS transistor is ON when input to its gate is a type your answer... voltage or logic type your answer... . PMOS is good at passing logic type your answer... , NMOS is good passing logic type your answer... . PMOS is used in upper half of the circuit to connect to type your answer... voltage, NMOS is used in type your answer... half of the circuit to connect to type your answer...
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