Bk-precision 4034 - Manual Manual do Utilizador descarregar pdf (Página 12)

R1 R2 = Z1 Z2, and R1 Z1 = R2 (Z2-Z1)

and

For example: to match a 50Ω system to a 125Ω system, Z1 equals 50Ω and Z2 equals 125Ω

Therefore:

Ω

and

Ω

Although the illustrated network provides minimum attenuation, for a purely resistive impedance-matching device,

the attenuation as seen from one end does not equal that seen from the other end. A signal (E1) applied from the

lower impedance source, encounters a voltage attenuation (A1) which is greater than 1 and less than 2, as follows:

A signal (E2) applied from the higher impedance source (Z2) encounters a greater voltage attenuation (A2), which is

greater than 1 and less than 2 (Z2/Z1):

In the example of matching 50Ω to 125Ω,

and

R Z Z Z1 2 2 1= −( )

R Z

Z Z

2 1

−

R1 125 125 50 968= − =( ) .

R2 50

125

125 50

64 6=

−

= .

1= = +

1= = + +

968

125

1 177= + =

968

64 6

968

1 4 43= + + =

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 71 72

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Bk-precision 4034 - Manual Manual do Utilizador Página 12