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Signal Processing

Question 1. What is the output voltage Vout when PA2 is high, PA1 is high, and PAO is low? Assume VoH is3.3V and VoL = 0V.

In terms of a DAC define resolution, range, precision, monotonic.

How do you extend the 4-bit binary-weighted DAC to 6-bits?

. Design a 6-bit R-2R DAC.

Write C code that increments a variable, but forces it to a range of 0 to 31 (0,1,2,3, ... 29,30,31,0,1,2,..)

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Signal Processing

, what is the lowest frequency at which good coupling exists?

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Signal Processing

The discrete-circuit common-emitter amplifier in figure, the transistor is operating at a dc collector current of 1 mA and has B = 120, fr =1 GHz, and Cu = 0.5 pF.

(1)Find the midband gain Am

(ii)Calculate the low frequency FL

(ii)Calculate the low frequency FH

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Signal Processing

\text { For the common-source amplifier in the Figure, } g_{m}=2 \frac{\mathrm{mA}}{V} \text {, and } C_{g s}=20 \mathrm{fF} \text { and } C_{g d}=5 \mathrm{fF} \text {. }

Draw the small signal equivalent circuit at mid-band and find the mid-band gain Am

Draw the small-signal equivalent circuit at low frequency and calculate FL.

Draw the small-signal equivalent circuit at high frequency and calculate FH.

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Signal Processing

Problem Statement-A common emitter amplifiers shown has the following design parameters:BJT intrinsic parameters-

\beta_{\mathrm{f}}=80, r_{\pi}=1600 \Omega, C_{\pi}=10 \mathrm{pF}, C_{\mu}=10 \mathrm{pF}

External resistors are-

R_{S}=200 \Omega, R_{1}=7000 \Omega, R_{2}=4500 \Omega, R_{E}=300 \Omega, R_{C}=5 k \Omega, R_{L}=5 k \Omega

External capacitors

C_{1}=10 \mu F, C_{2}=2 \mu F, C_{E}=100 \mu F, C_{x}=10 \mathrm{pF}

Use short-circuit zero value single time-constant method to calculate

a)Midband gain vo/vs

b)Low frequency poles due to the three capacitors C1, C2, and CE

c)An estimate of the lower 3-dB frequency, fL

d)The high frequency poles

e)An estimate of the 3-dB frequency, fH

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Signal Processing

(50 pts) Design a compensator for the system below to provide a closed-loop response thatsatisfies the following requirements:

\text { - } e_{5 s}=0 \text { for a constant reference }

-9005=5 \%

-t_{5} \approx 1.2 \mathrm{sec}(\pm 1 \%)

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Signal Processing

Angle of Departure

(20 pts) Draw the root locus for the following system on the axes below. Show all calculations onthe following page for:

b. Gain value at imaginary axis crossings

C. Location of imaginary axis crossings

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Signal Processing

s) For the following system, determine the steady-state error to a ramp input, r(t)2.5t.

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Signal Processing

6. (10 pts) The open-loop Bode plot below is for a system with no open-loop right-half-plane poles.What is the system's phase margin (Give a numeric value and indicate on the plot)? What is the approximate overshoot of the closed-loop step response?

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Signal Processing

(10 pts) The steady-state.response of a stable system.to a sinusoidal input function will, itself, bea sinusoid of the same frequency as the input function, with the only difference being the ratio of input to output amplitude, and a phase shift between the input and output sinusoids. Using the transfer function for the system (T(s) relating the input, u, to the output, y), how can you mathematically determine the amplitude ratio and the phase shift for a given input sinusoidal frequency, w?

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