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參數(shù)資料
| 型號： | OP471FY |
| 廠商： | PRECISION MONOLITHICS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | High Speed, Low Noise Quad Operational Amplifier |
| 中文描述： | QUAD OP-AMP, 2000 uV OFFSET-MAX, 6.5 MHz BAND WIDTH, CDIP14 |
| 封裝： | HERMETIC SEALED, DIP-14 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 314K |
| 代理商： | OP471FY |
REV. A
OP471
–13–
Low Phase Error Amplifier
The simple amplifier depicted in Figure 18 utilizes monolithic
matched operational amplifiers and a few resistors to substan-
tially reduce phase error compared to conventional amplifier
designs. At a given gain, the frequency range for a specified phase
accuracy is over a decade greater than for a standard single op
amp amplifier.
The low phase error amplifier performs second-order frequency
compensation through the response of op amp A2 in the feed-
back loop of A1. Both op amps must be extremely well matched
in frequency response. At low frequencies, the A1 feedback loop
forces V
2
/(K1 + 1) = V
IN
. The A2 feedback loop forces Vo/(K1 +1)
= V
2
/(K1 + 1) yielding an overall transfer function of V
O
/V
IN
=
K1 + 1. The dc gain is determined by the resistor divider at
the output, V
O
, and is not directly affected by the resistor divider
around A2. Note that similar to a conventional single op amp
amplifier, the dc gain is set by resistor ratios only. Minimum
gain for the low phase error amplifier is 10.
Figure 19 compares the phase error performance of the low
phase error amplifier with a conventional single op amp amplifier
and a cascaded two-stage amplifier. The low phase error amplifier
shows a much lower phase error, particularly for frequencies where
/
for the single op amp amplifier, but at 0.11 /
phase error amplifier.
For more detailed information on the low phase error amplifier,
see Application Note AN-107.
T
< 0.1. For example, phase error of –0.1
∞
occurs at 0.002 /
T
T
for the low
R2
1/4
OP471E
A2
R1
V
O
= (K
1
+ 1) V
IN
1/4
OP471E
A1
R1
K1
V
O
R2
K1
V
IN
R2 = R1
ASSUME: A1 AND A2 ARE MATCHED.
A
O
(s) =
T
s
V2
Figure 18. Low Phase Error Amplifier
FREQUENCY RATIO – 1/ ,
/
T
0
0.001
P
–1
–2
–3
–4
–5
0.01
0.1
1
0.005
0.05
0.5
–6
–7
SINGLE OP AMP
(CONVENTIONAL
DESIGN)
CASCADED
(TWO STAGES)
LOW-PHASE ERROR
AMPLIFIER
Figure 19. Phase Error Comparison
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP-471FY | 制造商:AD 制造商全稱:Analog Devices 功能描述:HIGH SPEED, LOW NOISE QUAD OPERATIONAL AMPLIFIER |
| OP471GP | 制造商:Analog Devices 功能描述:OP AMP QUAD LOW NOISE DIP14 471 |
| OP-471GP | 制造商:AD 制造商全稱:Analog Devices 功能描述:HIGH SPEED, LOW NOISE QUAD OPERATIONAL AMPLIFIER |
| OP471GPZ | 制造商:Analog Devices 功能描述:OP Amp Quad GP ±18V 14-Pin PDIP N 制造商:Analog Devices 功能描述:OP AMP QUAD LOW NOISE DIP14 471 |
| OP471GS | 功能描述:IC OPAMP GP 6.5MHZ QUAD 16SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作溫度:-40°C ~ 85°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) |
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