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Review of Carter: SLOA035C Amplifiers and Bits An Introduction to Selecting Amplifiers for Data Converters

Download SLOA035C Amplifiers and Bits An Introduction to Selecting Amplifiers for Data Converters from Texas Instruments (2010, 27 pages, 472 KB pdf file. The full list of authors is Carter, Rowland, Karki and Miller)

On page 2 and 3 of this app note the authors explain why it is often a good idea to put an Op Amp between the signal source and your Analog Digital Converter (ADC). Pages 4 -10 discuss how you can determine the necessary bandwidth and slew rate of the Op Amp (you can find more information about Op Amps in Op Amps For Everyone by Ron Mancini). Pages 11 - 16 describe the noise specifications of an Op Amp and their relation to the converter bits of the ADC. The terms Total Harmonic Distortion plus Noise (THD + N), Signal to Noise Ratio (SNR), Signal to Noise and Distortion (SINAD) and Effective Number of Bits (ENOB) are explained. Then some details of the interface between Op Amp and ADC are discussed, also a more detailed look at the slew rate and a discussion of settling time.

Appendix A (page 24 -26) is a design example, a Cellular Telephone Base Station. Unless you already know about the foundations of modern communication systems you will find this design example hard to follow.

The other free E-books and Application Notes from Texas Instruments are also very interesting.

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