参数资料
| 型号： | OP270FZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 5MHZ DUAL PREC 8CDIP |
| 标准包装： | 48 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 转换速率： | 2.4 V/µs |
| 增益带宽积： | 5MHz |
| 电流 - 输入偏压： | 10nA |
| 电压 - 输入偏移： | 20µV |
| 电流 - 电源： | 4mA |
| 电压 - 电源，单路/双路(±)： | ±4.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-CERDIP |
| 包装： | 管件 |
| 产品目录页面： | 772 (CN2011-ZH PDF) |
OP270
Rev. E | Page 16 of 20
LOW PHASE ERROR AMPLIFIER
The simple amplifier depicted in Figure 41 utilizes a monolithic
dual operational amplifier and a few resistors to substantially
reduce phase error compared with conventional amplifier
designs. At a given gain, the frequency range for a specified
phase accuracy is more than a decade greater than that of a
standard single op amp amplifier.
The low phase error amplifier performs second-order fre-
quency compensation through the response of Op Amp A2 in
the feedback loop of A1. Both op amps must be extremely well
matched in frequency response. At low frequencies, the A1
feedback loop forces V2/(K1 + 1) = VIN. The A2 feedback loop
forces VO/(K1 + 1) = V2/(K1 + 1), yielding an overall transfer
function of VO/VIN = K1 + 1. The dc gain is determined by the
resistor divider at the output, VO, and is not directly affected by
the resistor divider around A2. Note that, like 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.
00
32
5-
0
42
1/2
OP270E
A2
1/2
OP270E
A1
R1
VO
V2
VIN
R1
K1
R2
R2 = R1
ωT
s
R2
K2
VO = (K1 + 1)VIN
ASSUME A1 AND A2 ARE MATCHED.
AO(s) =
Figure 41. Low Phase Error Amplifier
Figure 42 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 ω/βωT < 0.1. For example, a phase error of
0.1° occurs at 0.002 ω/βωT for the single op amp amplifier, but
at 0.11 ω/βωT for the low phase error amplifier.
00
35
2-
0
43
–7
–6
–5
–4
–3
–2
–1
0
P
H
AS
E
S
H
IF
T
(
D
eg
re
es)
FREQUENCY RATIO (1/βω)(ω/ωT)
0.001
0.005
0.01
0.1
1
LOW PHASE ERROR
AMPLIFIER
CASCADED
(TWO STAGES)
SINGLE OP AMP.
CONVENTIONAL DESIGN
0.05
0.5
Figure 42. Phase Error Comparison
FIVE-BAND, LOW NOISE, STEREO GRAPHIC
EQUALIZER
The graphic equalizer circuit shown in Figure 43 provides 15 dB
of boost or cut over a five-band range. Signal-to-noise ratio over
a 20 kHz bandwidth is better than 100 dB and referred to a 3 V
rms input. Larger inductors can be replaced by active inductors,
but consequently reduces the signal-to-noise ratio.
00
325
-04
4
1/2
OP270E
1/2
OP270E
R2
3.3k
R1
47k
R4
1k
60Hz
TANTALUM
VOUT
VIN
R14
100
R13
3.3k
C2
6.8F
L1
1H
C1
0.47F
R3
680
200Hz
R6
1k
800Hz
R8
1k
3kHz
R10
1k
10kHz
R12
1k
+
TANTALUM
C3
1F
L2
600mH
R5
680
+
C4
0.22F
L3
180mH
R7
680
+
C5
0.047F
L4
60mH
R9
680
+
C6
0.022F
L5
10mH
R11
680
+
Figure 43. Five-Band, Low Noise Graphic Equalizer
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相关代理商/技术参数 |
参数描述 |
|---|---|
| OP-270FZ | 制造商:AD 制造商全称:Analog Devices 功能描述:DUAL VERY LOW NOISE PRECISION OPERATIONAL AMPLIFIER |
| OP-270G | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual/Quad Low Noise, Precision Operational Amplifiers |
| OP270GBC | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Feedback Operational Amplifier |
| OP270GN8 | 功能描述:IC PREC OPAMP LO NOIS DUAL 8DIP RoHS:否 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
| OP-270GN8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual/Quad Low Noise, Precision Operational Amplifiers |
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