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CIRCUITS and SYSTEMS – part I I

This lecture covers ideal operational amplifier circuits, including voltage adding circuits, integrators, differentiators, phase shifters, negative impedance converters, gyrators, and the Mason signal flow graph.

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CIRCUITS and SYSTEMS – part I I

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  1. CIRCUITS and SYSTEMS – part II Prof. dr hab. Stanisław Osowski Electrical Engineering (B.Sc.) Projekt współfinansowany przez Unię Europejską w ramach Europejskiego Funduszu Społecznego. Publikacja dystrybuowana jest bezpłatnie

  2. Lecture 14 Operational amplifier circuits

  3. Ideal operational amplifier • Infinite gain A • Zero output impedance • Infinite input impedance • These features valid for frequency from 0 to infinity.

  4. 2-port model of ideal op-amp Hybrid description

  5. Voltage adding circuit

  6. Voltage adding circuit - equations Kirchhoff’s equations After simplification we get

  7. Voltage adding circuit - gains

  8. Integrator Transfer function

  9. Differentiator Transfer function

  10. Phase shifter Kirchhoff’s equations

  11. Phase shifter (cont.) The currents Output voltage Transfer function

  12. Negative impedance converter (NIC) Kirchhoff’s equations Chain matrix description

  13. Gyrator Kirchhoff’s equations Admittance matrix description

  14. Mason signal flow graph (SFG) Basic notions: • Node – the point of graph associated with variable x • Branch – the directed arch joining 2 nodes • Gain – the transfer function describing branch • Loop – the sequence of identically directed branches forming closed loop • Gain of the loop – the product of gains of branches of the loop • Source node – the node from which the branches can only start • Cascade – the sequence of identically directed branches from the source node to the output node.

  15. Example of SFG Set of linear equations Transformation to Mason form Mason SFG

  16. Mason gain formula Transfer function Δ - main determinant of SFG Gains of all loops Gains of non-touching loops Tk – gain of kth cascade from source to output node Δk - determinant of graph after eliminating kth cascade from SFG

  17. Example Graph Transfer function

  18. Direct construction of SFG for passive elements connection Circuit Its SFG

  19. Direct construction of SFG for op-amp Op-amp Its SFG

  20. Example

  21. SFG of the circuit After simplification at we finally get

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