Measuring op amp settling time by using sample-and-hold technique
Modern high-speed operational amplifiers (op amps) are designed with settling time in the range of nanoseconds. In today’s op amp datasheets, settling time is usually given as a simulated value due to the cost and challenges associated with implementing additional hardware to test it on the bench. Traditional high-speed oscilloscopes have only a 10-bit analog-to-digital converter, which limits any measurement resolution to a maximum of 0.1%. This paper describes a new methodology that has proven to be effective in making these measurements. Detailed is a relatively inexpensive and simple way to measure settling time that bases accuracy and precision on the relative speed of the waveform generator and the sample-and-hold circuit.
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