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参数资料
| 型号： | W671340P |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 模拟传输电路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 11/48页 |
| 文件大小： | 1344K |
| 代理商： | W671340P |
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W671300 SERIES
G2-4 =
VTX
EG
---------- =
ZL 2RP
–
2 ZL 2RP ZO
+
(
)
------------------------------------------------
–
ZO
2 ZL 2RP ZO
+
(
)
------------------------------------------------
–
=
(EQ. 38)
A more useful form of the equation is rewritten in terms of VTX/V2W. A voltage divider equation is
written to convert from EG to V2W as shown below.
V2W =
ZO + 2RP
ZL ZO
+
+ 2RP
----------------------------------------
EG
(EQ. 39)
Substituting ZL = ZO + 2RP and rearranging in terms of EG yields the following.
EG = 2V2W
(EQ. 40)
Substituting this into equation [38] results in a description for 2-wire to 4-wire gain which is a function
of the synthesized input impedance of the SLIC and the protection resistors.
G2-4 =
VTX
V2W
------------ =
ZO
ZL 2RP ZO
+
(
)
--------------------------------------------
–
0.416
=
(EQ. 41)
If ZL is 600, ZO is programmed with RS to be 498.76 (66.5k/133.33), and RP is equal to 49.9. This
results in a 2-wire to 4-wire gain of 0.416 or -7.6dB.
When the protection resistors are set to zero, the transmit gain is -6dB.
7.1.7.5. Transhybrid Gain
The transhybrid gain is defined as the 4-wire to 4-wire gain (G44).
G44
G42 G
×
24
RS
RIN
----------
–
ZO
ZL 2RP ZO
+
---------------------------------------
=
(EQ. 42)
Publication Release Date: March 2004
- 19 -
Revision 0.5
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