Analog design
How to Choose an Op Amp for a Real Circuit
Start from what the circuit has to do, not from a parametric search sorted by price.
Topic
Analog design
Amplifiers, signal chains, converters and references.
Analog design
Why Op Amps Oscillate with Capacitive Loads
One nanofarad is fine and ten is not, and the arithmetic says why to the degree.
Analog design
Rail-to-Rail Op Amps: What Rail-to-Rail Actually Means
Two separate claims, neither of which promises the rail, and both of which depend on the load.
Analog design
Common-Mode Input Range: Why an Op Amp Can Fail Before It Saturates
The output is nowhere near a rail, the arithmetic is right, and the reading is still wrong.
Analog design
Input Bias Current: When Nanoamps Matter
Ten nanoamps into a one-megohm source is ten millivolts of error, nearly seventy times the offset.
Analog design
Input Offset Voltage: How Small Errors Become Large Output Errors
150 microvolts at the input is 22 converter codes at the output, and calibration only removes part of it.
Analog design
Slew Rate: The Op-Amp Limit That Gain-Bandwidth Does Not Explain
The same amplifier is good to 1 MHz with a small signal and to 40 kHz with a large one.
Analog design
Gain-Bandwidth Product: Why Op-Amp Gain Falls with Frequency
A gain of 119 from a 1 MHz part leaves you 8.4 kHz, and nothing on the schematic says so.
Analog design
Inverting vs Non-Inverting Op Amps: What Actually Changes
Same two resistors, two circuits, and three differences the gain equations never show.