參數(shù)資料
型號： THS3002EVM
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
文件頁數(shù)： 19/32頁
文件大?。?/td> 633K
代理商： THS3002EVM
THS3001, THS3002
420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
SLOS217A – JULY 1998 – REVISED JUNE 1999
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
recommended feedback and gain resistor values
The THS300x is fabricated using Texas Instruments 30-V complementary bipolar process, HVBiCOM. This
process provides the excellent isolation and extremely high slew rates that result in superior distortion
characteristics.
As with all current-feedback amplifiers, the bandwidth of the THS300x is an inversely proportional function of
the value of the feedback resistor (see Figures 26 to 34). The recommended resistors for the optimum frequency
response are shown in Table 1. These should be used as a starting point and once optimum values are found,
1% tolerance resistors should be used to maintain frequency response characteristics. For most applications,
a feedback resistor value of 1 k
is recommended – a good compromise between bandwidth and phase margin
that yields a very stable amplifier.
Consistent with current-feedback amplifiers, increasing the gain is best accomplished by changing the gain
resistor, not the feedback resistor. This is because the bandwidth of the amplifier is dominated by the feedback
resistor value and internal dominant-pole capacitor. The ability to control the amplifier gain independent of the
bandwidth constitutes a major advantage of current-feedback amplifiers over conventional voltage-feedback
amplifiers. Therefore, once a frequency response is found suitable to a particular application, adjust the value
of the gain resistor to increase or decrease the overall amplifier gain.
Finally, it is important to realize the effects of the feedback resistance on distortion. Increasing the resistance
decreases the loop gain and increases the distortion. It is also important to know that decreasing load
impedance increases total harmonic distortion (THD). Typically, the third-order harmonic distortion increases
more than the second-order harmonic distortion.
Table 1. Recommended Resistor Values for Optimum Frequency Response
GAIN
RF for VCC =
±
15 V
1 k
680
620
560
RF for VCC =
±
5 V
1 k
750
620
620
1
2, –1
–2
5
offset voltage
The output offset voltage, (V
OO
) is the sum of the input offset voltage (V
IO
) and both input bias currents (I
IB
) times
the corresponding gains. The following schematic and formula can be used to calculate the output offset
voltage:
VOO
VIO
1
RF
RG
IIB
RS
1
RF
RG
IIB–RF
+
–
VIO
+
RG
RS
RF
IIB–
VO
IIB+
Figure 48. Output Offset Voltage Model
相關(guān)PDF資料
PDF描述
THS3002ID 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002IDGN 420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3095DR HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
THS3002ID 制造商:TI 制造商全稱:Texas Instruments 功能描述:420-MHz HIGH-SPEED CURRENT-FEEDBACK AMPLIFIERS
THS3002IDGN 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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THS3014-TK 功能描述:手持示波器 100 MHz 4 Channel Handheld w/ Trvl Kit RoHS:否 制造商:Fluke 帶寬:200 MHz 采樣比:2.5 GS/s 顯示器類型:153 mm Full Color LCD 設(shè)備類型:Oscilloscopes
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