參數(shù)資料
型號(hào): THS3001HVID
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: GREEN, PLASTIC, MS-012AA, SOIC-8
文件頁(yè)數(shù): 18/36頁(yè)
文件大?。?/td> 1065K
代理商: THS3001HVID
www.ti.com
VI
VO
C1
+
RG
RF
R1
f
*3 dB +
1
2pR1C1
V
O
V
I
+
1 )
R
F
R
G
1
1 ) sR1C1
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
*3 dB
+
1
2pRC
+
C1
RF
RG
VO
VI
THS3001
V
O
V
I
+
R
F
R
G
S
)
1
R
F
C1
S
SLOS217G – JULY 1998 – REVISED MARCH 2008
Figure 56. Single-Pole Low-Pass Filter
If a multiple-pole filter is required, the use of a Sallen-Key filter can work well with CFB amplifiers. This is
because the filtering elements are not in the negative feedback loop and stability is not compromised. Because of
their high slew rates and high bandwidths, CFB amplifiers can create accurate signals and help minimize
distortion. An example is shown in Figure 57.
Figure 57. 2-Pole Low-Pass Sallen-Key Filter
There are two simple ways to create an integrator with a CFB amplifier. The first, shown in Figure 58, adds a
resistor in series with the capacitor. This is acceptable because at high frequencies, the resistor is dominant and
the feedback impedance never drops below the resistor value. The second, shown in Figure 59, uses positive
feedback to create the integration. Caution is advised because oscillations can occur due to the positive
feedback.
Figure 58. Inverting CFB Integrator
Copyright 1998–2008, Texas Instruments Incorporated
25
Product Folder Link(s): THS3001
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