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參數(shù)資料
| 型號： | AD8011AR-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | 300 MHz, 1 mA Current Feedback Amplifier |
| 中文描述： | OP-AMP, 6000 uV OFFSET-MAX, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 219K |
| 代理商： | AD8011AR-REEL7 |
REV. B
–10–
AD8011
This analysis assumes perfect current sources and infinite tran-
sistor V
A
s (Q3, Q4 output conductances are assumed zero).
These assumptions result in actual vs. model open loop voltage
gain and associated input referred error terms being less accurate
for low gain (G) noninverting operation at the frequencies below
the open loop pole of the AD8011. This is primarily a result of
the input signal (V
P
) modulating the output conductances of
Q3/Q4 resulting in R
I
less negative than derived here. For invert-
ing operation, the actual vs. model dc error terms are relatively
much less.
AC TRANSFER CHARACTERISTICS
The ac small signal transfer derivations below are based on a
simplified single-pole model. Though inaccurate at frequencies
approaching the closed-loop BW (CLBW) of the AD8011 at low
noninverting external gains, they still provide a fair approximation
and a intuitive understanding of its primary ac small signal
characteristics.
For inverting operation and high noninverting gains these trans-
fer equations provide a good approximation to the actual ac
performance of the device.
To accurately quantify the V
O
vs. V
P
relationship, both A
O
(s)
and T
O
(s) need to be derived. This can be seen by the following
nonexpanded noninverting gain relationship:
V
O
(
s
)/
V
P
(
s
)
=
G
G
A
O
[
s
]
+
R
F
T
O
[
s
]
+
1
with
A
O
(
s
)
=
R
1
×
g
mf
×
|
A
2|
1
–
g
mc
×
R
1
S
τ
1
1
–
g
mc
×
R
1
1E+03 1E+04 1E+05 1E+06 1E+07 1E+08 1E+09
FREQUENCY
–
Hz
80
70
60
50
40
20
10
30
G
–
–
90
P
–
–
100
–
110
–
120
–
160
PHASE
GAIN
0
–
10
–
20
–
30
–
170
–
180
–
190
–
200
–
130
–
140
–
150
A
O
(s)
Figure 30. Open-Loop Voltage Gain and Phase
(error current times the open loop inverting input resistance)
that results (see Figure 29), a more exact low frequency closed
loop transfer functions can be described as:
A
V
=
G
1
+
G
×
R
I
T
O
+
R
F
T
O
=
G
1
+
G
A
O
+
R
F
T
O
for noninverting (G is positive)
A
V
=
G
1
+
1
–
G
A
O
+
R
F
T
O
for inverting (G is negative)
R
S
L
N
T
O
(s)
A
O
(s)
V
P
Z
I
IE
L
I
R
N
C
P
R
F
+V
S
–
V
S
L
S
R
L
C
L
V
O
L
S
Z
I
= OPEN LOOP INPUT IMPEDANCE = C
I
|| R
L
Figure 29. Z
I
= Open-Loop Input Impedance
where G is the ideal gain as previously described. With
R
I
= T
O
/A
O
(open-loop inverting input resistance), the second
expression (positive G) clearly relates to the classical voltage
feedback
“
op amp
”
equation with T
O
omitted do to its relatively
much higher value and thus insignificant effect. A
O
and T
O
are
the open-loop dc voltage and transresistance gains of the ampli-
fier respectively. These key transfer variables can be described as:
A
R
gmf
A
g
R
R
A
R
gmc
×
2
R
gmf
O
O
I
mc
T
=
×
×
×
=
×
=
×
1
2
1
1
1
2
2
1
1
|
|
(
–
)
|
|
;
and
therefore
Where g
mc
is the positive feedback transconductance (not
shown) and 1/g
mf
is the thermal emitter resistance of devices
D1/D2 and Q3/Q4. The g
mc
×
R1 product has a design value that
results in a negative dc open loop gain of typically
–
2500 V/V (see
Figure 30).
Though atypical of conventional CF or VF amps, this negative
open-loop voltage gain results in an input referred error term
(V
P
–
V
O
/G = G/A
O
+ R
F
/T
O
) that will typically be negative for G
greater than +3/
–
4. As an example, for G = 10, A
O
=
–
2500 and
T
O
= 1.2 M
, results in a error of
–
3 mV using the A
V
deriva-
tion above.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD8011ARZ | 功能描述:IC OPAMP CF LP LDIST 30MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:- 轉換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8011ARZ | 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC 制造商:Analog Devices 功能描述:IC, OP-AMP, 300MHZ, 3500V/ us, SOIC-8 |
| AD8011ARZ | 制造商:Analog Devices 功能描述:IC AMPLIS |
| AD8011ARZ-REEL | 功能描述:IC OPAMP CF LP LDIST 30MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 其它有關文件:Automotive Product Guide 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉換速率:3 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:70µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:48mA 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:SOT-23-6 供應商設備封裝:SOT-6 包裝:Digi-Reel® 其它名稱:MAX4475AUT#TG16DKR |
| AD8011ARZ-REEL7 | 功能描述:IC OPAMP CF LP LDIST 30MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 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） 供應商設備封裝:8-SO 包裝:管件 |
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