參數(shù)資料
型號(hào)： OP270GSZ-REEL
廠商： Analog Devices Inc
文件頁數(shù)： 8/20頁
文件大小： 0K
描述： IC OPAMP GP 5MHZ DUAL LN 16SOIC
標(biāo)準(zhǔn)包裝： 1,000
放大器類型： 通用
電路數(shù)： 2
轉(zhuǎn)換速率： 2.4 V/µs
增益帶寬積： 5MHz
電流 - 輸入偏壓： 15nA
電壓 - 輸入偏移： 50µV
電流 - 電源： 4mA
電壓 - 電源，單路/雙路(±)： ±4.5 V ~ 18 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC W
包裝： 帶卷 (TR)
其它名稱： OP270GSZ-REEL-ND
OP270GSZ-REELTR
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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參數(shù)描述
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