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Question 44328

posted 9 months ago

When the switch is flipped so the capacitor is discharging, what is the new Kirchoff loop?

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Question 44327

posted 9 months ago

Below is the charging position for an RC circuit. Please write a Kirchoff loop equation (
\Delta V=0 \text { ) for this loop using } V_{b a t t}, V_{\text {cap }} \text {, and } V_{R}

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Question 44389

posted 10 months ago

For the above transistor circuit, values are:
R_{1}=18 \mathrm{k} \Omega, R_{2}=162 \mathrm{k} \Omega, R_{E}=2 \mathrm{k} \Omega, R_{C}=20 \mathrm{k} \Omega, \beta=80 \text { and } V_{E B}(\mathrm{on})=0.7 \mathrm{~V} .
Find the following:
The value of the voltage drop VRE.
The value of small signal parameters, and Im.
Draw the small signal AC (Hybrid-Pi) model for the above circuit.

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Question 44390

posted 10 months ago

For the circuit shown the parameters are: Vpp = 3.3 V,Rp = 10kohms, R 140kohms, R2 = 60 kohms, and Rsi =4 kohms. The transistor parameters are: VTN = 0.4 V, K, = 0.5 mA/V2, and 2 0.02 v-.
1. Find Ipo. VDsQ
2. Draw the small signal H-Pi model.

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Question 44405

posted 10 months ago

The transistor parameters for the circuit shown in Figure 1 are ß = 100, VBE(on) = 0.7 V(except Q4),VA = 50 V for Q, and Q, and VA = 100 V for Q, and Qu.
(a) Derive an expression for lo. (4 r
(b) If /, = 200 HA and IREF = 1 mA, Vee +5V and VEE-5V, find the values of R, and RE4.
\text { (c) Find } I_{E 1} \text { and } I_{E 2}, r_{o 1}, r_{o 2}, r_{o 4}, g_{m 4} \text { and } r_{\pi 1}, r_{\pi 2}, r_{\pi 4} \text {. }
(d) Draw the small-signal equivalent circuit in differential-mode operation
\text { (e) Find an expression for the differential voltage gain } A_{v i d}=\frac{v_{0}}{v_{i d}} \text {, }
\text { (f) If } R_{C}=20 \mathrm{k} \Omega \text {, find the value of } A_{v i d}=\frac{v_{0}}{v_{i d}} \text {. }
(g) Draw the small-signal equivalent circuit in common-mode operation
\text { (h) Find an expression for the single-ended common-mode voltage gain } A_{c m}=\frac{v_{0}}{v_{c m}} \text {. }
\text { (i) Derive an expression for the constant current source output voltage }\left(R_{04}^{C S}\right) \text {. }
Consider the NMOS current source in Figure 2, all transistors are matched.
\text { (j) What is the value of } R_{04}^{C S} \text { ? (2 }
(k) What is the value of the common-mode voltage gain?
(1) Find the CMRR.

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Question 44406

posted 10 months ago

Consider the NMOS current source in Figure 2, all transistors are matched.
(a) Derive an expression for the output resistance looking into the drain of Q6. (
\text { b) If } I_{R E F}=0.4 \mathrm{~mA} \mathrm{~s}: K_{n}=0.4 \frac{\mathrm{mA}}{\mathrm{V}^{2}}, V_{T N}=1 \mathrm{~V} \text {. and } \lambda=0.02 \mathrm{~V}^{-1} \text {. What is } R_{o}^{c S} \text { ? }

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Question 44468

posted 10 months ago

1.Circuit 1: Mesh Analysis: Perform mesh analysis by hand of the circuit below and obtain the mesh currents I1,l2 and I3 as shown in the circuit. Include your handwritten circuit analysis to the right and below of the circuit and results in spaces provided. List your equations in Standard Form and clearly label them (ie Mesh l2 KVL, etc). Then use a software tool such as Matlab to do the final step. Note: Resistances are in ohms.

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Question 44478

posted 10 months ago

An RL circuit is connected to a battery, as shown in Fig. 3.31. Switch S isinitially closed and is opened at time r = 0.
a. Find the inductor current it (1) for t > 0. (Hint: Note that while the switch is closed, the diode is reverse-biased and can be assumed to be an open
circuit. Immediately after the switch is opened, the diode becomes forward-biased and can be assumed to be a short circuit.)
b. What are the initial and final (1 = 00) values of the stored energy in the inductor? What is the energy stored in the inductor as a function of time?
c. What is the power dissipated in the resistor as a function of time? What is the total energy dissipated in the resistor?

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Question 44479

posted 10 months ago

The two-winding magnetic circuit of Fig. 3.41 has a winding on a fixedyoke and a second winding on a moveable element. The moveable elementis constrained to motion such that the lengths g of both air gaps remain equal.
a. Find the self-inductances of windings I and 2 in terms of the core dimensions and the number of turns.
b. Find the mutual inductance between the two windings.
\text { c. Find the coenergy } W_{f d}^{\prime}\left(i_{1}, i_{2}\right) \text {. }
d. Find an expression for the force acting on the moveable element as a function of the winding currents.

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Question 44476

posted 10 months ago

3.3 Consider the magnetic circuit of Example 1.2. For the stated operating condition (a) find the magnetic stored energy from Eq. 3.21 and (b) Find
(i) the inductance of the N-turn winding, (ii) the winding flux linkages and
(iii) the magnetic stored energy from Eq. 3.19.

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