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# more_opamp_hints - How to measure the open-loop gain of...

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How to measure the open-loop gain of high-gain amplifiers: 10 kž 10 kž 100 kž 1 kž In the circuit to the right, apply an AC input signal as indicated and measure the amplifier output voltage and the voltage at the junction of the two 10 k resistors (call this Vx). The amplifier gain is then 101 times Vout/Vx. You may want to reduce all the resistor values by a factor of 10 from the values given. Note also: this or some similar network needs to be in place when you are doing general testing: op-amps dont bias up correctly unless feedback is applied. How to measure the offset voltage of high-gain amplifiers: 10 kž 10 kž 100 kž 1 kž The DC output voltage will be about 200 times the input offset voltage. How to measure the CMRR of high-gain amplifiers: 1 kž 1 Mž 1 kž 1 Mž If the resistors are well-matched (take the time to find resistors accurate to 1% or better before testing), then the circuit gain will be about (2000)A CM /A D

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-Vee Examples of OP-AMP Circuits: A very simple one, but still with good
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more_opamp_hints - How to measure the open-loop gain of...

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