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Composite Amplifier Stability Analysis Schemes | Tim Green, MGTS

Detailed analysis of composite amplifier stability using two schemes, focusing on loop gain, phase margin, and DC operating points to ensure linear operation. Learn from the precision in linear analog applications. Schematics applicable in the TINA-TI SPICE simulator.

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Composite Amplifier Stability Analysis Schemes | Tim Green, MGTS

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  1. Composite Amplifier Stability AnalysisFirst Scheme & Second Scheme Tim Green, MGTS Precision Linear Analog Applications August 7, 2014

  2. First Scheme - Loop Gain Op Amp U1 Run DC Operating Point first to be sure all op amp inputs and outputs are in the linear region of operation. Otherwise AC Analysis is not valid if op amp outputs are saturated or common mode inputs violated.

  3. First Scheme - Loop Gain Op Amp U1 Loop Gain Phase Margin = 68.9deg

  4. First Scheme - Loop Gain Op Amp U2 Run DC Operating Point first to be sure all op amp inputs and outputs are in the linear region of operation. Otherwise AC Analysis is not valid if op amp outputs are saturated or common mode inputs violated.

  5. First Scheme - Loop Gain Op Amp U2 Loop Gain Phase Margin = 77.1deg

  6. First Scheme - Loop Gain Op Amp U2 Loop Gain Phase Margin = 77.1deg

  7. Second Scheme - Loop Gain Op Amp U1 Run DC Operating Point first to be sure all op amp inputs and outputs are in the linear region of operation. Otherwise AC Analysis is not valid if op amp outputs are saturated or common mode inputs violated.

  8. Second Scheme - Loop Gain Op Amp U1 Loop Gain Phase Margin = 69.9deg

  9. Second Scheme - Loop Gain Op Amp U2 Run DC Operating Point first to be sure all op amp inputs and outputs are in the linear region of operation. Otherwise AC Analysis is not valid if op amp outputs are saturated or common mode inputs violated.

  10. Second Scheme - Loop Gain Op Amp U2 Loop Gain Phase Margin = 62.5deg

  11. All Embedded Schematics in this presentation can be run in the Free TINA_TI SPICE simulator available at: http://www.ti.com/tool/tina-ti

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