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When a number of two-port networks are cascaded then

When a number of two-port networks are cascaded then Correct Answer ABCD-parameters are multiplied

  • When a number of two-port networks are connected in series, then the z-parameters gets added up
  • When a number of two-port networks are connected in parallel, then the y-parameters gets added up
  • When a number of two-port networks are connected in cascade, then the ABCD-parameters gets multiplied
  • When a number of two-port networks are connected in series parallel, then the h-parameters gets added up


Important points:

Two-port network parameters

Equations

Z parameters

V1 = Z11I1 + Z12I2

V2 = Z21I1 + Z22I2

Y parameters

I1 = Y11V1 + Y12V2

I2 = Y21V1 + Y22V2

h parameters

V1 = h11I1 + h12V2

I2 = h21I1 + h22V2

g parameters

I1 = g11V1 + g12I2

V2 = g21V1 + g22I2

T parameters (ABCD)

V1 = AV2 – BI2

I1 = CV2 – DI2

Inverse T parameters

V2 = A’V1 – B’I1

I2 = C’V1 – D’I1

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