Paul
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Hi,
In order to properly answer this question, you must give more information. In what set-up do you measure your chip: package, chip-on-board, wafer probing? Will you be able to use high-impedance probes (take care, their bandwidth is usually limited) or will you have 50-Ohm equipement (typical for RF measurements).
In the latter case, you cannot attach the measurement equipment directly to your amplifier output, except it has low-impedance output. Single-stage amplifiers usually are OTAs, not opamps and cannot drive such a low-impedance load. You need a buffer stage in between the OTA and the 50-Ohm equipment.
To simulate this, you simply have to include a model of the measurement equipment, typically a load resistor to ground with a load capacitor in parallel. You find the values for these components in your probe/scope data sheet.
Paul
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