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EECS 140 Midterm 2, Spring 1995 - Analog Integrated Circuits, Exams of Electrical Circuit Analysis

Cochin University of Science and TechnologyElectrical Circuit Analysis

The midterm 2 exam for the analog integrated circuits course, eecs 140, held at the university of california, berkeley in spring 1995. The exam consists of three problems related to analog circuits, focusing on feedback types, voltage gains, transresistances, and loop gains. Students are required to calculate and explain their results.

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B.E. BOSER Analog Integrated Circuits
Midterm 2
Thursday, April 6, 1995
EECS 140
SPRING 1995
Name: ...
This exam has 3 problems with equal weights. Show how you arrived at each result to get credit. Please mark
results clearly with a box around them. Write the answers directly on the exam sheets.
Device Parameters: (unless otherwise indicated)
NPN: Is = 5x10-15A, βF = 100, VA = 100V, VBE(on) ≈ 0.7V, VCE(sat) = 0.2V,
Cje0 = 1pF, τf = 0.3ns, Cµ = 0.5pF
PNP: Is = 2x10-15A, βF = 50, VA = 50V, VBE(on) ≈ -0.7V, VCE(sat) = -0.2V,
Cje0 = 0.5pF, τf = 20ns, Cµ = 0.5pF
NMOS: µnCox = 50µA/V2, Vth0 = +0.7V, λn = 0.02V-1 @ L = 4um, γn= 0.4sqrt(V), 2Φf = 0.6V
PMOS: µpCox = 25µA/V2, Vth0 = -0.7V, λp = 0.05V-1 @ L = 4um, γp = 0.6sqrt(V), |2Φf| = 0.6V
V ≈ 26 mV (300 K)
Problem #1
In the amplifier shown below a dc biasing circuit (no shown) makes that the large signal output voltage is Vo
= 1V. Ci is a large coupling capacitor. Assume that the circuit is compensated to ensure stability.
(a) what is the type of feedback used?
(b) what is the feedback factor, f?
(c) what is the loop gain, T, at low frequence?
(d) what is the low-frequency, small-signal voltage gain vo/vi of the circuit?
(e) what is the low frequency input resistance, Ri?
(f) what is the low frequency output resistance, Ro?
Problem #2
For the circuit below, find
(a) the low-frequency transresistance Rx = vo/isig, and
(b) the bandwidth f-3db (use zero valued time constants).
EE 140, Midterm #2, Spring 1995
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B.E. BOSER Analog Integrated Circuits

Midterm 2

Thursday, April 6, 1995

EECS 140

SPRING 1995

Name: ...

This exam has 3 problems with equal weights. Show how you arrived at each result to get credit. Please mark results clearly with a box around them. Write the answers directly on the exam sheets.

Device Parameters: (unless otherwise indicated)

NPN: Is = 5x10-15A, βF = 100, VA = 100V, VBE( on ) ≈0.7V, VCE( sat )^ = 0.2V, Cje0 = 1pF, τf = 0.3ns, Cμ = 0.5pF PNP: Is = 2x10-15A, βF = 50, VA = 50V, VBE( on ) ≈-0.7V, VCE( sat )^ = -0.2V, Cje0 = 0.5pF, τf = 20ns, Cμ = 0.5pF NMOS: μnCox = 50μA/V^2 , Vth0 = +0.7V, λn = 0.02V-1^ @ L = 4um, γn= 0.4sqrt(V), 2Φf = 0.6V PMOS: μpCox = 25μA/V^2 , Vth0 = -0.7V, λp = 0.05V-1^ @ L = 4um, γp = 0.6sqrt(V), |2Φf| = 0.6V V T≈ 26 mV (300 K)

Problem # In the amplifier shown below a dc biasing circuit (no shown) makes that the large signal output voltage is Vo = 1V. C i is a large coupling capacitor. Assume that the circuit is compensated to ensure stability. (a) what is the type of feedback used? (b) what is the feedback factor, f? (c) what is the loop gain, T , at low frequence? (d) what is the low-frequency, small-signal voltage gain vo / vi of the circuit? (e) what is the low frequency input resistance, Ri? (f) what is the low frequency output resistance, Ro?

Problem # For the circuit below, find (a) the low-frequency transresistance Rx = vo / isig , and (b) the bandwidth f -3 db (use zero valued time constants).

EE 140, Midterm #2, Spring 1995

(c) write and expression for the frequency response Vo ( s )/ Isig ( s ) (polynomial is s ). Include only the dominant pole and ignore zeroes.

Problem # In the amplifier below you may neglect base currents when determining dc conditions. (a) What is the overall feedback used? (b) Find the low-frequency loop-gain To. (c) Determine the closed-loop voltage gain, vo / vi at low frequencies. (d) Determine the closed-loop input and output resistances Ri and Ro.

Posted by HKN (Electrical Engineering and Computer Science Honor Society) University of California at Berkeley If you have any questions about these online exams please contact [email protected].

EE 140, Midterm #2, Spring 1995