參數(shù)資料
型號(hào)： THS3002
廠商： Texas Instruments, Inc.
英文描述： 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
中文描述： 420 - MHz高速電流反饋放大器
文件頁(yè)數(shù)： 26/32頁(yè)
文件大小： 633K
代理商： THS3002
THS3001, THS3002
420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
SLOS217A – JULY 1998 – REVISED JUNE 1999
26
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
general configurations
A common error for the first-time CFB user is the creation of a unity gain buffer amplifier by shorting the output
directly to the inverting input. A CFB amplifier in this configuration will oscillate and is
not
recommended. The
THS300x, like all CFB amplifiers,
must
have a feedback resistor for stable operation. Additionally, placing
capacitors directly from the output to the inverting input is not recommended. This is because, at high
frequencies, a capacitor has a very low impedance. This results in an unstable amplifier and should not be
considered when using a current-feedback amplifier. Because of this, integrators and simple low-pass filters,
which are easily implemented on a VFB amplifier, have to be designed slightly differently. If filtering is required,
simply place an RC-filter at the noninverting terminal of the operational-amplifier (see Figure 57).
VI
VO
C1
+
–
RG
RF
R1
f–3dB
1
2 R1C1
VO
VI
1
RF
RG
1
1
sR1C1
Figure 57. Single-Pole Low-Pass Filter
If a multiple-pole filter is required, the use of a Sallen-Key filter can work very 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 very accurate signals and help minimize
distortion. An example is shown in Figure 58.
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 58. 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 59, 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 60, uses
positive feedback to create the integration. Caution is advised because oscillations can occur due to the positive
feedback.
相關(guān)PDF資料
PDF描述
THS3002CD 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002D 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002DGN 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002EVM 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002ID 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS3002CD 制造商:TI 制造商全稱:Texas Instruments 功能描述:420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002CDGN 制造商:TI 制造商全稱:Texas Instruments 功能描述:420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002D 制造商:TI 制造商全稱:Texas Instruments 功能描述:420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002DGN 制造商:TI 制造商全稱:Texas Instruments 功能描述:420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002EVM 制造商:TI 制造商全稱:Texas Instruments 功能描述:420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
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