Q1. (a) Using the hybrid-pi model with early voltage effect, compute the small signal voltage gain, Av, input resistance and output resistance for the CE BJT amplifier shown below. Vcc = 12 V B=100 V BE(ON) = 0.7V V =100V R = 93.7k2 * R=6 kN Vo Rs= 0.5 k2 C E Vs R,= 6.3 kN
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- NFET Common Source Amplifier with Source Degeneration: For the circuit below, assume the MOSFET operates in saturation and is characterized by parameters V_TN and K_NThe transistor parameters for the NMOS common source amplifier given in the figure are VTN = 1.0V, kn = 0.8mA / V2 and alpha = 0. Circuit parameters are VDD = 10V, RS = 0.8k, RD = 3K, R1 = 210K and R2 = 140k. Find the IDQ drain current and VDSQ drain-source voltage at the transistor's Q - operating point. Determine in which region the transistor is operating.Vs=100 mV peak-to-peak, 1 kHz sine signal, Kn=0.4mA/v^2 ,Vt=1V , λ=0.01V^-1 Make the DC analysis of the above given mosfet amplifier circuit. Simulation to tableWrite down the measured values and mathematical calculation results. (The valueswith the units.)DC Parameters ,Measured value ,Calculated ValueVGETCVGSVDVDSIDb. Draw the small signal model for the AC analysis of the circuit. Find the gm, ro, Av values.c. Show the Vs input signal and the Vo output signal of the circuit on the oscilloscope. Volt/div of channels andSpecify time/div values.
- The given circuit is a 2N4403 PNP common collector amplifier. Let VCC=12V, VEE=-12V, R1=52.5kΩ, R2=33kΩ, and RE=2.5kΩ. Determine IB, IC, IE, VB, VC, and VE. Start by initially assuming |VBE| =0.7V or and assuming a value of beta (β). Where to look for the value of β? (Hint: It’s in the transistor model assigned). Determine the input voltage (may extend from the supply voltage range) where the BJT goes from “cut-off to active” and where it goes from “active to saturation”. Assume VCE=0.3V (edge of saturation), RL=500Ω, and C1, C2→∞.For the BJT amplifier circuit of figure below with the following parameters:β = hfe ≈ 250, re= 20.3Ω, and ro = 1/hoe ≈ ∞ Ω, Zb= 50.26KΩ determine:(a) Draw the Ac equivalent circuit in re- model and hybrid model.(b) hie, , Zi , and Zo'(c) Av using h- model.(d) Avs and ac output voltageThe small-signal resistance (i.e., dv/dlp) in kn offered by the n-channel MOSFET M shown in the figure below, at a bias point of V 2V is. (Device data for M: device transconductance parameter, = KN = H₂Cox () = 40, threshold voltage VTN = 1V, and neglect body effect and Lambda)
- Derive the expression for the following in terms ONLY of the small signalparameters and the given circuit components from the hybrid-pi model (Neglect the effect of the BJT’s small signal output resistancero):a.) RINb.) Gmc.) ROUTSuppose the tail current source is implemented using another transistor with the same BJT parameters, what would be the common-mode input range of this amplifier? Where V2>= VCM>=V1. Determine V1 and V2.a.) Consider a two-BJT configuration in Figure 1. You may assume that both transistors are the same with the same β, VBE,on = 0.7 V, and VCE,EOS = 0.3 V. Determine the minimum voltage VBE that will turn ON both Q1 and Q2. b.) Using the BJT small-signal model given in Figure 2, determine the AC current gain Ai = iout/iin for the circuit given in Figure 3. Assume ro >> rπ. You may assume that β is large.
- 5) Design a Common source E-MOSFET amplifier and write the formula of voltage gain.What type of bias circuit can be used for the BJT amplifiers? Can the same type of bias circuit be configured as different types of BJT amplifier? Briefly answer.In the circuit given in the figure, Vcc = 15 V, R1 = R2 = 10kΩ, RE = 1KΩ, RL = 0.5kΩ and transistor parameters are given as VBE = 0.7V, ßdc = ß0 = 100. a. Calculate the values of DC bias currents and voltages (IBQ, ICQ and VCEQ). b. Draw the small signal equivalent circuit of the circuit using the hybrid model of the transistor. c. Derive the input impedance expression of the circuit and calculate its value. d. Derive the AVI and AVG voltage gain expressions and calculate their values. e. Derive the current gain expression AI = I0 / Ii and calculate its value. Compare this value you have calculated with the value you will calculate using the expression Aİ = Zi AVI / RL.