Online amplifier parameter evaluation tools speed up the amplifier selection process. Designing circuits with op amps is difficult to establish a formulaic pattern, except for the occasional use of error budgets. Although analog system designers have special considerations for op amps, they rely on experience to determine which parameters will eventually cause problems. The tasks of an amplifier range from simply isolating a signal source from a load to generating gain, shifting DC levels, and increasing load current. Once the needs of a circuit are determined, designers begin calculating the amplifier parameters required to meet these tasks. Most of the calculations are simple, even for a novice. Calculating the current that an op amp must provide and the required headroom is simple, but there are many other parameters that affect the performance of a circuit. For example, full-power bandwidth, slew rate, input offset voltage, bias current, offset current, open-loop gain, common-mode rejection ratio (CMRR), and allowable input differential voltage are just a few of them.
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