參數(shù)資料
型號(hào)： W671520P
廠商： WINBOND ELECTRONICS CORP
元件分類： 模擬傳輸電路
英文描述： TELECOM-SLIC, PQCC28
封裝： PLASTIC, LCC-28
文件頁(yè)數(shù)： 10/42頁(yè)
文件大?。?/td> 1230K
代理商： W671520P
W671500 SERIES
By monitoring the current at the amplifier output, a negative feedback mechanism sets the output
voltage for a defined load. The amplifier gains are set by resistor ratios (RA, RB, RC) providing all the
performance benefits of matched resistors. The internal sense resistor, RCS, is much smaller than the
gain resistors and is typically 20 for this device. The feedback mechanism, KS, represents the
amplifier configuration providing the negative feedback.
7.2.2.3. Transhybrid Balance
The final step in completing the impedance synthesis design is calculating the necessary gains for
transhybrid balance. The AC feedback loop produces an echo at the VTX output of the signal injected
at VRX. The echo must be cancelled to maintain voice quality. Most applications will use a summing
amplifier in the CODEC front end as shown below to cancel the echo signal.
+
-
R
F
R
B
R
A
RSLIC
CODEC
+2.4V
RX OUT
TX IN
-IN
VRX
VTX
R
+ -
1:1
R
S
T
A
FIGURE 8: TRANSHYBRID BALANCE INTERFACE
The resistor ratio, RF/RB, provides the final adjustment for the transmit gain, GTX with respect to the 2-
wire to 4-wire gain G24 as expressed in the following equation.
GTX
G
24
RF
RB
--------
=
(EQ. 27)
Most applications set RF = RB, making the device 2-wire to 4-wire gain equal the transmit gain.
Typically RB is greater than 20k to prevent loading of the device transmit output.
The resistor ratio, RF/RA, is determined by the transhybrid gain of the device, G44. RF is previously
defined by the transmit gain requirement and RA is calculated using the following equation.
RA
RB
G44
----------
=
(EQ. 28)
- 18 -
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