(a) A differential-amplifier has a differential-mode gain of
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Microelectronics: Circuit Analysis and Design
- Consider an amplifier circuit below, given gm=50mA/V. Calculate the voltage gain (AV= vO/vS), current gain (Ai=iO/iS), and power gain in decibels (AP=pO/pS).arrow_forwardThe ac equivalent circuit for an amplifier is shown . Assume the capacitors have infinite value, RI = 10 kΩ, RB = 5 MΩ, RC = 1.5 MΩ, and R3 = 3.3 MΩ. Calculate the input resistance and output resistance for the amplifier if the BJT Q-point is (2 μA, 2 V). Assume βo = 40 and VA = 50 V. Rework the given problem if IC is increased to 100 μA, and the values of RC, RB, and R3 are all reduced by a factor of 50.arrow_forward2. For the differential amplifier circuit shown below , calculate the output voltage (including polarity) for the following values of V X and V Y .a. V X = 1.5 V and V Y = - 1 V.b. V X = - 2 V and V Y = - 1.5 V.c. V X = 8 V and V Y =10 V.d. V X = 5.5 V and V Y = 6.25 V.arrow_forward
- Assume that the numerical values for the voltage areVm=50 mV and t1=1 s. We apply this voltage to the integrating-amplifiercircuit . The circuit parameters of the amplifier areRs=100 kΩ, Cf=0.1 μF, and VCC=6 V. The capacitor’s initial voltage is zero.1. Calculate vo(t).arrow_forwardFor the given amplifier circuit, asnwer the following question: a) For R1= 12 kΩ, R2= 10 kΩ, RE= 1 kΩ, RC = 1.2 kΩ, determine the following dc parameters: VB, VE, IE, and VC . (assume stiff voltage divider) b) For r’e = 5.5 Ω, R1= 12 kΩ, R2= 10 kΩ, RE= 1 kΩ, RC = 1.2 kΩ, RL = 7.5 kΩ, RS = 500 Ω, determine the input resistance at the base ( Rin(base) ), the total input resistance ( Rin(tot) ), voltage gain (Av) ,and attenaution. c) Assume that the overall voltage gain A’v = 120, the dc collector voltage VC = 6.3 V, and Vin = 15 mV rms. Determine the ac collector voltage (Vc) , then draw the total collector voltage waveform d) For r’e = 5.5 Ω, RE= 1 kΩ, RC = 1.2 kΩ, RL = 7.5 kΩ, determine the voltage gain if C2 is removed. Explain the effect of removing C2 on gain stability.arrow_forward1.A voltage amplifier is used to amplify radio signals from the antenna in a car radio system. The incoming radio signal voltage from the antenna, vs = 500 mV and its resistance is Rs = 100 N. Assume the open circuit voltage gain of the amplifier, 100 and the output resistance is 1 k. i. Design the amplifier by finding its input resistance, R; if the amplifier voltage gain (vo/vs) is given as 20. ii. If the amplifier output is connected to a speaker (load), find the new amplifier voltage gain (vo/vs) if the load resistance, R1, value is 1 kN.arrow_forward
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