Block Diagrams

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For a negative-feedback loop with forward gain G and feedback H, the closed-loop transfer function is:

A.G/(1 + GH)

B.G/(1 − GH)

C.GH/(1 + G)

D.1/(GH)

Two transfer functions in a parallel connection combine to give an overall transfer function of:

A.G1 × G2

B.G1 + G2

C.G1/(1+G2)

D.G1 − G2 only

Two blocks with transfer functions G₁ and G₂ connected in cascade (series) have an overall transfer function of:

A.G₁ + G₂

B.G₁ · G₂

C.G₁ / G₂

D.G₁ − G₂

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