※ 引述《kattte (誠實面對自己吧!)》之銘言:
: -----------R2---[+ 50V -]-----------------
: | | | | |
: | 電 7ma | | |
: R1 流 向下 R3 R4 RL
: | 源 | | |
: | | | | |
: --------------------------------[+ 20V -]-
: All resistors are 3.3k ohm.
: Use the The'venin equivalent to find V(RL).
: 用線上模擬電路跑的結果是 2.98v
: 可是我算了好幾次都差很多 @@
: 不知道該怎麼算?
----------R2---[+ 50V -]-----------------
| | | | |
| 電 7ma | | |
R1 流 向下 R3 R4 RL
| 源 | | |
| | | | |
--------------------------------[+ 20V -]-
=================================================
先電流源轉電壓源
----------R2---[+ 50V -]-----------------
| | | |
|- | | |
電壓源=3.3k ohm*7mA R3 R4 RL
|+ =23.1V | | |
| | | |
-------R1-----------------------[+ 20V -]-
===================================================
合併50V和23.1V R1 R2
-----------------------------------------
| | | |
|- | | |
電壓源=23.1+50V R3 R4 RL
|+ =73.1V | | |
| | | |
-------R1+R2-------------------[+ 20V -]-
=6.6k ohm
=====================================================
再變回電流源=73.1/6.6=11.076mA
-----------------------------------------
| | | | |
| | | | |
↓11.076mA R1+R2 R3 R4 RL
| | | | |
| | | | |
--------------------------------[+ 20V -]-
===================================================
R1~R4並聯=1.32k ohm
再轉成電壓源
Vall=11.076*1.32=14.62V
-----------------------------------------
| |
|- |
14.62V RL
|+ |
| |
------Rall----------------[+ 20V -]-
Vout=14.62-20=-5.38V
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