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)： 22/32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
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
slew rate
The slew rate performance of a current-feedback amplifier, like the THS300x, is affected by many different
factors. Some of these factors are external to the device, such as amplifier configuration and PCB parasitics,
and others are internal to the device, such as available currents and node capacitance. Understanding some
of these factors should help the PCB designer arrive at a more optimum circuit with fewer problems.
Whether the THS300x is used in an inverting amplifier configuration or a noninverting configuration can impact
the output slew rate. As can be seen from the specification tables as well as some of the figures in this data sheet,
slew-rate performance in the inverting configuration is faster than in the noninverting configuration. This is
because in the inverting configuration the input terminals of the amplifier are at a virtual ground and do not
significantly change voltage as the input changes. Consequently, the time to charge any capacitance on these
input nodes is less than for the noninverting configuration, where the input nodes actually do change in voltage
an amount equal to the size of the input step. In addition, any PCB parasitic capacitance on the input nodes
degrades the slew rate further simply because there is more capacitance to charge. Also, if the supply voltage
(V
CC
) to the amplifier is reduced, slew rate decreases because there is less current available within the amplifier
to charge the capacitance on the input nodes as well as other internal nodes.
Internally, the THS300x has other factors that impact the slew rate. The amplifier’s behavior during the slew-rate
transition varies slightly depending upon the rise time of the input. This is because of the way the input stage
handles faster and faster input edges. Slew rates (as measured at the amplifier output) of less than about
1500 V/
μ
s are processed by the input stage in a very linear fashion. Consequently, the output waveform
smoothly transitions between initial and final voltage levels. This is shown in Figure 51. For slew rates greater
than 1500 V/
μ
s, additional slew-enhancing transistors present in the input stage begin to turn on to support
these faster signals. The result is an amplifier with extremely fast slew-rate capabilities. Figures 41 and 52 show
waveforms for these faster slew rates. The additional aberrations present in the output waveform with these
faster-slewing input signals are due to the brief saturation of the internal current mirrors. This phenomenon,
which typically lasts less than 20 ns, is considered normal operation and is not detrimental to the device in any
way. If for any reason this type of response is not desired, then increasing the feedback resistor or slowing down
the input-signal slew rate reduces the effect.
Figure 51
t – Time – ns
SR = 1500 V/
μ
s
Gain = 5
VCC =
±
15 V
RL = 150
RF = 1 k
tr/tf = 10 ns
SLEW RATE
10
0
5
–5
2
0
0
60
40
20
80
100
140
120
160
180 200
4
–10
–15
–
V
VI
Figure 52
t – Time – ns
SR = 2400 V/
μ
s
Gain = 5
VCC =
±
15 V
RL = 150
RF = 1 k
tr/tf = 5 ns
SLEW RATE
–2
0
5
–5
2
0
0
60
40
20
80
100
140
120
160
180 200
4
–10
–15
–
V
VI
相關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
THS3096DR HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS
THS3092DR HIGH-VOLTAGE, LOW-DISTORTION, CURRENT-FEEDBACK OPERATIONAL AMPLIFIERS
相關代理商/技術參數(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
THS3014 功能描述:手持示波器 100 MHz 4 Channel Handheld Scope 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 設備類型:Oscilloscopes
THS3014 CAL D 制造商:DANAHER - TEKTRONIX 功能描述:TEK P/N THS3014 CALIBRATED W/DATA BY TRANSCAT, CHILD SKU # 63T8001 制造商:Tektronix Inc 功能描述:TEK P/N THS3014 CALIBRATED W/DATA BY TRANSCAT, CHILD SKU # 63T8001
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 設備類型:Oscilloscopes
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