Objective: To help understand more about high speed op amps, specifically op-amp feedback and application.
Length: 90 minutes
Published Date: Jul 30, 04
Step(s) to complete
- View online seminar
- Complete the suggested assignments
- Complete the online test to receive a certificate from Bob Pease
Online Seminar:
LMH High Speed Operational Amplifiers
About the Presentor: Martin Giles, Linear Applications Manager
This seminar discusses the latest information on National's new LMH process, including its core features and system benefits.
About the Instructor: Hooman Hashemi is a Principal Applications Engineer, Amplifiers Product Group, Santa Clara, who joined National Semiconductor Corp. in 1995. He received a BSEE at San Jose State University and a MSEE at Santa Clara University
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| Suggested Assignments |
Reading Assignment:
OA-20 Application note, "Current Feedback Myths Debunked", provides a basic understanding of current-feedback in high-speed op-amps.
Additional Resources:
OA-13 Application note, "Current Feedback Loop Gain Analysis and Performance
Enhancement", provides more information on current feedback and gives
information on how to improve high speed performance.
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Research Assignment:
- The LMH op-amps are replacing the CLC op-amps. Which op-amp is equivalent to the CLC404? (Hint: Go to national's website to the amplifiers home page, find the Comlinear Op Amp Obsolescence Information section.)
- Go into the datasheet of the op-amp above and look at the graph that shows the non-inverting small signal response. For Av=+2, what would be the -3dB BW? What is the recommended value of feedback resistor (Rf)? How much frequency response peaking is associated with this value of feedback resistor?
- In a Current Feedback Amplifier, what is analogous to the Voltage Feedback Amplifier's Loop Gain and how is it measured?
CHECK ALL ANSWERS HERE
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