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參數(shù)資料
| 型號： | OPA655P |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶，單位增益穩(wěn)定，F(xiàn)ET輸入運(yùn)算放大器 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 222K |
| 代理商： | OPA655P |
9
OPA655
β
= V
–
/V
O
Non-Inverting Gain = Noise Gain = NG = 1/
β
Taking the inverting amplifier as an example,
β
is found by
setting V
SOURCE
to zero and calculating the voltage divider
ratio from V
O
to V
–
:
R
1
+ R
T
|| R
S
= total resistance to ground on the
inverting input
The resulting bandwidth is approximately the amplifier’s
gain bandwidth product divided by the calculated noise gain:
BW
≈
GBW/NG
In practice, low noise gains (< 5) will produce a wider
bandwidth than predicted due to the peaking effect of second
order poles. For example, at an inverting gain of –1 from a
zero ohm source impedance, this yields a non-inverting gain
of 2 and an approximate signal bandwidth of 185MHz.
TYPICAL APPLICATIONS
WIDEBAND TRANSIMPEDANCE AMPLIFIER
The high gain bandwidth product and low noise of the
OPA655 make it particularly suitable for wideband
transimpedance applications. The front page of the data
sheet shows measured results for a 1M
transimpedance
gain from a relatively large diode having 47pF parasitic
capacitance. The key to broadband transimpedance applica-
tions is to set the compensation capacitance across the
feedback resistor to achieve a flat, or bandlimited, frequency
high FET input impedance and low closed loop output
impedance. Remember that a DC path to the input is still
necessary; even with the ultra low FET input bias current
(5pA), open or capacitively coupled sources will cause the
input to saturate. For best frequency response, a direct short
between the output and inverting inputs is suggested. Since
the input bias currents are not necessarily correlated, match-
ing the non-inverting source resistance with a resistor in the
feedback network is not recommended.
FIGURE 2. Non-Inverting Unity Gain Buffer.
The non-inverting amplifier configuration (Figure 3) will
again present a very high input impedance to the input signal
and a low output impedance drive with signal gain. The
100
shown for R
F
will give the frequency response shown
in the Typical Performance Curves. Higher values for R
F
and R
1
are possible but for high frequency non-inverting op
amp applications, should be limited to less than 1.0k
. The
amplifier will be loaded by (R
F
+ R
1
) in parallel with the
load impedance.
V
O
R
F
= 100
R
1
OPA655
V
IN
2
3
6
V
O
V
IN
= 1 +
R
F
R
1
FIGURE 3. Non-Inverting Op Amp.
The inverting amplifier configuration (Figure 4) offers a
broadband, low DC error amplifier with a controlled input
impedance. The input impedance may be set by adjusting R
1
to the desired value and then adjusting R
F
to the desired
gain, or by setting R
F
and R
1
to the desired values then
controlling the input impedance independently as the paral-
lel combination of R
1
and an optional R
T
resistor to ground.
To estimate the bandwidth in any configuration, first calcu-
late the gain as a non-inverting amplifier. This is often
referred to as “noise gain” or NG, and is simply the inverse
of the feedback factor
β
.
NG
=
β=
1
+
R
F
R
1
+
R
T
||R
S
FIGURE 4. Inverting Op Amp.
R
L
= 100
V
O
V
IN
V
O
= 1
6
Z
I
OPA655
2
3
V
IN
NOTE: Power supplies and de-coupling not shown.
Z
O
V
O
R
F
R
1
V
–
V
IN
R
S
R
T
V
SOURCE
2
3
6
V
O
V
IN
=–R
F
R
1
β =
V
–
V
O
=
R
1
+
R
T
||R
S
R
F
+
R
1
+
R
T
||R
S
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA655P | 制造商:Texas Instruments 功能描述:OP AMP WIDEBAND FET IP DIP8 655 |
| OPA655U | 功能描述:IC OPAMP VFB 240MHZ SGL WB 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品變化通告:Discontinuation 18/May/2012 標(biāo)準(zhǔn)包裝:2,000 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.42 V/µs 增益帶寬積:1.5MHz -3db帶寬:- 電流 - 輸入偏壓:15nA 電壓 - 輸入偏移:1000µV 電流 - 電源:116µA 電流 - 輸出 / 通道:100mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5 V，±0.9 V ~ 2.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:851 (CN2011-ZH PDF) 其它名稱:296-20930-2 |
| OPA656 | 制造商:BB 制造商全稱:BB 功能描述:Precision, High-Speed Transimpedance Amplifier |
| OPA656-DIE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDEBAND, UNITY-GAIN STABLE, FET-INPUT OPERATIONAL AMPLIFIER |
| OPA656MDREP | 功能描述:IC OPAMP VFB 230MHZ SGL 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:160 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:管件 |
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