Texas Instruments

Using op amps to reduce near-field EMI on PCBs

Automotive, industrial, medical, and many other applications use sensitive analog circuits that must perform their function while remaining immune to noise disturbances in their local environment. Many of these disturbances occur on nearby “noisy” circuits located on the same printed circuit board (PCB), while other interference can be picked up by cable interfaces that couple noise onto the PCB and its circuits.

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Automating amplifier circuit design

The semi-expert techniques for automating amplifier circuit designs calls for a combination of hard specification requirements and judgement margins. A design tool must support these techniques to zero in on the appropriate operational amplifier (op amp) and external components. Figure 1 shows two fundamental circuit examples that implore this type of tool.
Yes, these are simple topologies – but the difficulty is in the detail when selecting amplifiers and external components to meet the performance criteria for the application.

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