Feedback: For the feedback amplifier as shown, the op amp is characterized by a very high open-loop voltage gain and an output resistance r0 = 300 Ω, the feedback network is comprised of resistor R = 100 kΩ and C = 0.01 μF. Our goal is to find gain-with-feedback Af = vo/vs. Answer the following questions. a) What kind of feedback topology is this? What electrical quantity (current or voltage) is mixed at the input? What electrical quantity (current or voltage) is sampled at the output? b) Find the feedback input loading (R11) c) Find the feedback output loading (R22) d) Find the feedback factor β.
The common-base stage of the following figure is biased with a collector current of 2 mA. Assume IS = 8×10−16 A, β = 100, and VA = ∞. (a) Calculate the voltage gain and I/O impedances of the circuit. (b) How should Vb and RC be chosen to maximize the voltage gain with a bias current of 2 mA?
Estimate the low frequency voltage gain from Vb to Vc for the amplifier shown. Use Rc = 15.2 kΩ, Re = 0.7 kΩ and Rb = 0.9 kΩ. Assume that IC ≈ Ie, and neglect the effect of base-width modulation (Early effect).
(a) Calculate the gain of the common-source amplifier in Figure 1. if the transistor has Kn = 0.500 mA/V2, VTN = 1 V, and λ = 0.0133 V−1, and the Q-point is (0.241 mA, 3.81 V). (b) Compare the result in (a) to the common-source "rule-of-thumb" gain estimate and the amplification factor of the transistor. (c) What is the largest value of vi that can be considered to be a small-signal? Figure 1
Consider the given circuit. The MOSFETs are equal and have parameters kn = 0.1 mA/V2, λ = 0, Vtn = 1 V Calculate the asked parameters and fill in the table. a) Find the operating point currents (ID and IS) and voltage VO. b) Obtain small signal equivalent circuit with T model c) Small signal voltage gain Vo/Vsig