posted 9 months ago

posted 9 months ago

\Delta V=0 \text { ) for this loop using } V_{b a t t}, V_{\text {cap }} \text {, and } V_{R}

posted 10 months ago

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.

posted 10 months ago

1. Find Ipo. VDsQ

2. Draw the small signal H-Pi model.

posted 10 months ago

(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.

posted 10 months ago

(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 { ? }

posted 10 months ago

posted 10 months ago

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?

posted 10 months ago

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.

posted 10 months ago

(i) the inductance of the N-turn winding, (ii) the winding flux linkages and

(iii) the magnetic stored energy from Eq. 3.19.