Methods of measuring op amp settling time
Jim Williams
Servo, DAC and data acquisition amplifiers all require good dynamic response. In particular, the time required for an amplifier to settle to final value after an input step is especially important. This specification allows setting a circuit’s timing margins with confidence that the data produced is accurate. The settling time is the total length of time from input step application until the amplifier remains within a specified error band around the final value.
Figure 16.1 shows one way to measure amplifier settling time (see References 1, 2, and 3). The circuit uses the “false sum node” technique. The resistors and amplifier form a bridge-type network. Assuming ideal resistors, ...
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