RF RS RG
參數(shù)資料
型號(hào)： THS4031CDRG4
廠商： Texas Instruments
文件頁(yè)數(shù)： 16/47頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP VFB 100MHZ SGL 8SOIC
標(biāo)準(zhǔn)包裝： 2,500
放大器類型： 電壓反饋
電路數(shù)： 1
轉(zhuǎn)換速率： 100 V/µs
-3db帶寬： 100MHz
電流 - 輸入偏壓： 3µA
電壓 - 輸入偏移： 500µV
電流 - 電源： 8.5mA
電流 - 輸出 / 通道： 90mA
電壓 - 電源，單路/雙路(±)： 9 V ~ 32 V，±4.5 V ~ 16 V
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOIC
包裝： 帶卷 (TR)
配用： 296-10029-ND - EVAL MOD FOR THS4031
_
+
RF
RS
RG
eRg
eRf
eRs
en
IN+
Noiseless
IN
eni
eno
e
ni +
en
2
) IN )
R
S
2
) IN–
R
F
R
G
2
) 4 kTRs ) 4 kT RF RG
Where:
k = Boltzmann’s constant = 1.380658
× 1023
T = Temperature in degrees Kelvin (273 +
°C)
RF || RG = Parallel resistance of RF and RG
eno + eni AV + eni 1 )
R
F
R
G
(Noninverting Case)
www.ti.com
SLOS224G – JULY 1999 – REVISED MARCH 2010
NOISE CALCULATIONS AND NOISE FIGURE
Noise can cause errors on very small signals. This is especially true when amplifying small signals. The noise
model for the THS403x, shown in Figure 52, includes all of the noise sources as follows:
en = Amplifier internal voltage noise (nV/√Hz)
IN+ = Noninverting current noise (pA/
√Hz)
IN– = Inverting current noise (pA/
√Hz)
eRx = Thermal voltage noise associated with each resistor (eRx = 4 kTRx)
Figure 52. Noise Model
The total equivalent input noise density (eni) is calculated by using the following equation:
(1)
To get the equivalent output noise of the amplifier, just multiply the equivalent input noise density (eni) by the
overall amplifier gain (AV).
(2)
As the previous equations show, to keep noise at a minimum, small-value resistors should be used. As the
closed-loop gain is increased (by reducing RG), the input noise is reduced considerably because of the parallel
resistance term. This leads to the general conclusion that the most dominant noise sources are the source
resistor (RS) and the internal amplifier noise voltage (en). Because noise is summed in a root-mean-squares
method, noise sources smaller than 25% of the largest noise source can be effectively ignored. This advantage
can greatly simplify the formula and make noise calculations much easier to calculate.
For more information on noise analysis, refer to the application note, Noise Analysis for High-Speed Op Amps
Copyright 1999–2010, Texas Instruments Incorporated
23
Product Folder Link(s): THS4031 THS4032
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