SBOA571 august   2023 OPA2387 , OPA387 , OPA4387

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Example Considerations
  6. 3Introducing a Preconditioning Circuit
    1. 3.1 First Order Shelving Filter
    2. 3.2 Second Order Shelving Filter
    3. 3.3 Noise Contribution of the Second Order Shelving Filter
    4. 3.4 DC and AC Gain
  7. 4Design Procedure for the Second Order Shelving Filter
    1. 4.1 Definition of Boundary Conditions
    2. 4.2 Calculation of Component Values
  8. 5Influence of Component Tolerances
  9. 6Summary
  10. 7References

Design Procedure for the Second Order Shelving Filter

The second order shelving filter can be described by the following Laplace polynomial:

Equation 7. Gs=-s2C2C1R1R1+sC2R2+2C2R1+1sC3R3+2sC4R4+1s2C4C3R3R3+sC4R4+2C4R3+1sC1R1+2sC2R2+1×R3R1
Equation 8. Gs=-S0x12S03S04Spx34Sp1SP2×gain