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Op Amp Aol vs Vout Swing

Op Amp Aol vs Vout Swing. Tim Green & Art Kay 4/29/2014 Precision Analog Linear Applications. Datasheet Specifications. OPA180 Specs for Discussion Output – Voltage Output Swing from Rail Aol – Open Loop Voltage Gain. Output Swing.

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Op Amp Aol vs Vout Swing

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  1. Op Amp Aolvs Vout Swing Tim Green & Art Kay 4/29/2014 Precision Analog Linear Applications

  2. Datasheet Specifications • OPA180 Specs for Discussion • Output – Voltage Output Swing from Rail • Aol – Open Loop Voltage Gain

  3. Output Swing This is a NON-LINEAR test. The output is driven hard into output stage saturation.

  4. Aol is NOT guaranteed closer than 500mV to either rail V+ = +18V V- = -18V Point A: Vout = (V+) - 0.5V Vos = 35uV Aol = 114dB A Point B: Vout = (V+) - 0.25V Vos = 6000uV Aol = 69.42dB Aol = x2958 B Point B Closed Loop Gain: Acl=Aol/(1+Aolb) Acl= 2958 / (1+2958*0.0065) Acl=146 Acl should be x154 !! Gets WORSE Closer to the rail the output swings! Note: Beyond point “B” is Test Equipment Range Limitation

  5. Datasheet Specifications • Check Op Amp Datasheet for Op Amp used in application circuit as ALL Op Amps have this limitation! • Output – Voltage Output Swing from Rail • Output Saturation Specification • Aol – Open Loop Voltage Gain • Measured in Linear Operating Range • Note Vout Swing where Aol is Tested

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