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R u ( t ) u ( t ) u ( t ) u ( t ) i ( t ) i ( t ) i ( t ) i ( t ) R Output Impedance R ( Z ) “” u u ( t ) u ( t ) u ( t ) u ( t ) R R i ( t ) i ( t ) i ( t ) i ( t ) VCXSCCXSXCVSXCCS R ( Z ) JOLuXO 0.6 JPX (Input and Output Impedance)Input Impedance

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(1)

0.6 輸入阻抗與輸出阻抗(Input and Output Impedance) Input Impedance Rin (Zin)

i1(t) i2(t)

υ1(t) υ2(t)

i1(t) i2(t)

υ1(t) υ2(t)

Output Impedance Rout (Zout)

i1(t) i2(t)

υ1(t) υ2(t)

i1(t) i2(t)

υ1(t) υ2(t)

Rin Rin

Rout

Rout

輸入埠看成是無源線性網路

輸出埠看成是“有”源線性網路

VCXS CCXS

XCVS XCCS

(2)
(3)

例題

iin iout

υin υout

Rout

µυ1

Rin

υS

RS

RL

輸入及輸出阻抗對電壓放大器的影響

電壓放大器 負載（LOAD）

訊號源

（SOURCE）

in S

in S

in R R

R

=υ + υ

L out

L in

out R R

R

= µυ + υ

L out

L in

out

V R R

A R

= +

= µ

υ

υ 沒有考慮訊號源之輸出阻抗

(Source impedance)RS

(4)

L out

L in

S in

in out S

in S

out V

R R

R R

R R A

+

= +

⋅

=

′ =

µ

υ υ υ

υ υ

υ

輸入負載效應 輸出負載效應

∞

L →

∞ R

in → R

1 1

設計電壓放大器時，最好要求

>>

(5)

一般放大器設計時，由訊號源(source)和負載(load)所要的訊號來考慮

Power 剛剛好

剛剛好 Power

Current 愈大愈好

愈小愈好 Current

Voltage 愈小愈好

Voltage 愈大愈好

Rout 負載訊號 Rin

Source

考慮的由訊號源傳送到負載的最大功率，Rin要等於Source的輸出阻抗，

Rout要等於負載阻抗。

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