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參數資料
| 型號： | THS4021CDRG4 |
| 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： | PLASTIC, MS-012AA, SOIC-8 |
| 文件頁數： | 4/28頁 |
| 文件大小： | 922K |
| 代理商： | THS4021CDRG4 |
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Driving a Capacitive Load
+
_
THS402x
C
LOAD
1kW
Input
Output
50 W
20 W
S0278-01
Offset Nulling
_
+
THS402x
V
CC–
V
CC+
0.1 F
m
0.1 F
m
10kW
S0279-01
SLOS265C – SEPTEMBER 1999 – REVISED JULY 2007
Driving capacitive loads with high-performance amplifiers is not a problem as long as certain precautions are
taken. The first is to realize that the THS402x has been internally compensated to maximize its bandwidth and
slew-rate performance. When the amplifier is compensated in this manner, capacitive loading directly on the
output decreases the device phase margin, leading to high-frequency ringing or oscillations. Therefore, for
capacitive loads of greater than 10 pF, it is recommended that a resistor be placed in series with the output of
the amplifier, as shown in Figure 33. A minimum value of 20
should work well for most applications. For
example, in 75-
transmission systems, setting the series resistor value to 75 both isolates any capacitance
loading and provides the proper line impedance matching at the source end.
Figure 33. Driving a Capacitive Load
The THS402x has very low input offset voltage for a high-speed amplifier. However, if additional correction is
required, an offset nulling function has been provided on the THS4021. The input offset can be adjusted by
placing a potentiometer between terminals 1 and 8 of the device and tying the wiper to the negative supply. This
is shown in Figure 34.
Figure 34. Offset Nulling Schematic
12
Copyright 1999–2007, Texas Instruments Incorporated
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相關代理商/技術參數 |
參數描述 |
|---|---|
| THS4021D | 制造商:TI 制造商全稱:Texas Instruments 功能描述:350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4021DGN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:350-MHz LOW-NOISE HIGH-SPEED AMPLIFIERS |
| THS4021EVM | 功能描述:放大器 IC 開發工具 THS4021 Hi-Spd Amp Eval Mod RoHS:否 制造商:International Rectifier 產品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| THS4021ID | 功能描述:高速運算放大器 350MHz RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| THS4021IDG4 | 功能描述:高速運算放大器 Ultra-Low Noise Voltage-Feedback RoHS:否 制造商:Texas Instruments 通道數量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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