| Electronics > Beginners |
| What's the use of OpAmps? |
| << < (11/11) |
| David Hess:
Common rail-to-rail parts are not universal improved replacements however. Rail-to-rail input parts have compromised precision and common mode rejection over their input common mode range, usually close to the positive supply. Some parts do various things to improve this situation like external control of exactly where the input crossover point is so that it can be moved outside of the common mode input range but such a specialized part comes at a premium in cost and interoperability. Rail-to-rail and single supply inputs also inherently lack input bias current compensation because it requires compliance beyond the input range. Rail-to-rail output parts only approach the supply rails so if operation all the way to the supply rails is required, they are not the solution. Their common emitter/source output stages are also more finicky about load impedance. |
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