參數資料
型號: TLC085IPWPG4
廠商: Texas Instruments, Inc.
英文描述: TRANS PREBIASED NPN 200MW SOT23
中文描述: 家庭寬帶高輸出驅動單電源運算放大器
文件頁數: 20/52頁
文件大?。?/td> 1462K
代理商: TLC085IPWPG4
SLOS254D JUNE 1999 REVISED FEBRUARY 2004
20
WWW.TI.COM
APPLICATION INFORMATION
general configurations
When receiving low-level signals, limiting the bandwidth of the incoming signals into the system is often
required. The simplest way to accomplish this is to place an RC filter at the noninverting terminal of the amplifier
(see Figure 50).
VI
VO
C1
+
RG
RF
R1
f–3dB
1
2 R1C1
VO
VI
1
RF
RG
1
sR1C1
1
Figure 50. Single-Pole Low-Pass Filter
If even more attenuation is needed, a multiple pole filter is required. The Sallen-Key filter can be used for this
task. For best results, the amplifier should have a bandwidth that is 8 to 10 times the filter frequency bandwidth.
Failure to do this can result in phase shift of the amplifier.
VI
C2
R2
R1
C1
RF
RG
R1 = R2 = R
C1 = C2 = C
Q = Peaking Factor
(Butterworth Q = 0.707)
(
=
1
Q
2
)
RG
RF
_
+
f–3dB
1
2 RC
Figure 51. 2-Pole Low-Pass Sallen-Key Filter
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