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LMH High Speed Op Amps |
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Research Assignement Answers |
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| Q: |
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.) |
| A: |
LMH6714 |
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| Q: |
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? |
| A: |
400MHz, 300 Ohms, None
Look at the LMH6714 datasheet for the graph, Frequency Response vs Rf or
graph, Non-Inverting Small Signal Frequency Response. |
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| Q: |
In a Current Feedback Amplifier, what is analogous to the Voltage Feedback Amplifier's Loop Gain and how is it measured? |
| A: |
Current Feedback Amplifier is also characterized by its Loop Gain. However, in the case of the Current Feedback Amplifier, this is the difference between Op Amp's Transimpedance Gain (dBOhm) and the feedback resistor's value (dBOhm). See OA-20 Application Note. |
