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ECE 3042 HW4: Op Amp Diff. & Instr. Amplifier Design & Analysis, Assignments of Electrical and Electronics Engineering

Georgia Institute of Technology - Main CampusElectrical and Electronics Engineering

A homework assignment for ece 3042, a university-level electrical engineering course, focusing on the design and analysis of op amp differential and instrumentation amplifiers. Students are required to use cadance spice and national instruments spice (multisim) software to perform transient and harmonic analyses, and to plot the output voltage as a function of time. The assignment includes designing an op amp differential amplifier with a differential gain of 7.3 and a differential input impedance of 6 kω, and an op amp instrumentation amplifier with a differential gain of 32.2 and a differential input impedance of 400 kω. The students are also asked to compute the common mode rejection ratio (cmrr) in decibels for both amplifiers.

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Pre 2010

Uploaded on 08/05/2009

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ECE 3042
Homework Assignment No. 4
Fall 2006 Homework for Experiment No. 4
Due Week of October 9
1. Shown above is an op amp differential amplifier with a floating source input. Design this op amp
differential amplifier to have a differential gain of 7.3and a differential input impedance of 6kΩ. Assume that Rois
zero for the design calculations.
Use Cadance SPICE and National Instruments SPICE (Multisim) to perform a transient analysis of this
amplifier if the inputs are two single ended sources instead of the floating source. For the two inputs to the amplifier
use
v1(t)=A1sin(ω1t+φ1)+A2sin(ω2t+φ2)
and
v2(t)=A2sin(ω2t+φ2)
where A1= 120 mV, A2=10V, f1= 300 Hz, f2=60Hz, φ1=40
◦,andφ2=80
◦. Plot the output voltage as a
function of time for 0≤t≤50 ms. Use SPICE to perform a harmonic analysis of the output voltage.
Repeat the transient analysis if the feedback resistor is changed to 20% above the design value. Compute the
Common Mode Rejection Ratio (CMRR) in decibels.
pf2

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ECE 3042

Homework Assignment No. 4

Fall 2006 Homework for Experiment No. 4

Due Week of October 9

  1. Shown above is an op amp differential amplifier with a floating source input. Design this op amp differential amplifier to have a differential gain of 7. 3 and a differential input impedance of 6 kΩ. Assume that Ro is zero for the design calculations. Use Cadance SPICE and National Instruments SPICE (Multisim) to perform a transient analysis of this amplifier if the inputs are two single ended sources instead of the floating source. For the two inputs to the amplifier use v 1 (t) = A 1 sin(ω 1 t + φ 1 ) + A 2 sin(ω 2 t + φ 2 ) and v 2 (t) = A 2 sin(ω 2 t + φ 2 ) where A 1 = 120 mV, A 2 = 10 V, f 1 = 300 Hz, f 2 = 60 Hz, φ 1 = 40◦, and φ 2 = 80◦. Plot the output voltage as a function of time for 0 ≤ t ≤ 50 ms. Use SPICE to perform a harmonic analysis of the output voltage. Repeat the transient analysis if the feedback resistor is changed to 20% above the design value. Compute the Common Mode Rejection Ratio (CMRR) in decibels.
  1. Shown above is an op amp instrumentation amplifier with a floating source input. Design this op amp instrumentation amplifier to have a differential gain of 32. 2 and a differential input impedance of 400 kΩ. Use the differential amplifier designed in the previous problem as a component of the instrumentation amplifier. Assume that Ro is zero for the design calculations. Use Cadance SPICE and National Instruments SPICE (Multisim) to perform a transient analysis of this amplifier if the inputs are two single ended sources instead of the floating source. For the two inputs to the amplifier use the same signals as for Problem 1. Use SPICE to perform a harmonic analysis of the output voltage. Repeat the transient analysis if the feedback resistor in the output op amp is changed to 20% above the design value. Compute the Common Mode Rejection Ratio (CMRR) in decibels.