testing_opamps_2004

testing_opamps_2004 - First test Vout R1 Vgen C2 First test...

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First test R1 Vgen Vout R2 R3 C1 C2 First test circuit: Use this circuit not only to test the closed loop frequency response but also when you are checking general DC bias conditions and correct functional circuit operation. If you ground the input (set Vgen=0), the DC output voltage is equal to the amplifier DC offset voltage. That value you will need to know for the next measurement. R1 should be ~ 10 kOhm. The other component values you will need to calculated. second test R1 R2 R3 R4 Vgen Vout Vx Use this circuit when you need to measured the low-frequency open-loop gain of an op-amp. Make R1=R2=10 kOhm. Lets leave R3 and R4 unspecified for a moment. Apply an AC input signal Vgen as indicated. Adjust the generator amplitude until the output is 1 Volt peak-peak. Measure the amplifier output voltage and the voltage at the point labeled Vx. The op-amps open-loop gain is then 4 4 3 / ) ( R R R + times Vout/Vx. We face a difficulty with this test. The voltage at the point Vx has an amplitude of
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testing_opamps_2004 - First test Vout R1 Vgen C2 First test...

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