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| 型號： | OPA2634 |
| 英文描述： | Dual, Wideband, Single-Supply OPERATIONAL AMPLIFIER |
| 中文描述： | 雙路，寬帶，單電源運算放大器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 155K |
| 代理商： | OPA2634 |
11
OPA2634
1/2
OPA2634
+V
S
V
OUT
V
IN
R
3
R
2
R
1
R
4
FIGURE 5. DC Level-Shifting Circuit.
FIGURE 6. Compensated Non-Inverting Amplifier.
frequency of 5MHz, and a –60dB stopband starting at
12MHz. This filter works well on +5V or
±
5V supplies, and
with an A/D converter at 20MSPS (e.g., ADS900). V
IN
needs to be a very low impedance source, such as an op amp.
The filter transfer function was designed using Burr-Brown’s
FilterPro 42 design program (available at www.burr-
brown.com in the Applications section) with a nominal
stopband attenuation of 60dB. Table I gives the results (H
0
= DC gain, f
P
= pole frequency, Q
P
= pole quality, and f
Z
=
zero frequency). Note that the parameters were generated at
f
–3dB
= 5Hz, and then scaled to f
–3dB
= 5MHz.
SECTION NO.
H
0
1V/V
1V/V
1V/V
f
P
Q
P
1.77
0.64
—
f
Z
1
2
3
5.04MHz
5.31MHz
5.50MHz
12.6MHz
20.4MHz
—
TABLE I. Nominal Filter Parameters.
0
–10
–20
–30
–40
–50
–60
–70
–80
Frequency (MHz)
G
1
10
100
FIGURE 4. Nominal Filter Response.
Make sure that V
IN
and V
OUT
stay within the specified input
and output voltage ranges.
The front page circuit is a good example of this type of
application. It was designed to take V
IN
between 0V and
0.5V, and produce V
OUT
between 1V and 2V, when using a
+3V supply. This means G = 2.00, and
V
OUT
= 1.50V – G
0.25V = 1.00V. Plugging into the above equations gives:
NG = 2.33, R
1
= 375
, R
2
= 2.25k
, and R
3
= 563
. The
resistors were changed to the nearest standard values.
NON-INVERTING AMPLIFIER WITH
REDUCED PEAKING
Figure 6 shows a non-inverting amplifier that reduces peak-
ing at low gains. The resistor R
C
compensates the OPA2634
to have higher Noise Gain (NG), which reduces the AC
response peaking (typically 5dB at G = +1 without R
C
)
without changing the DC gain. V
IN
needs to be a low
impedance source, such as an op amp. The resistor values
are low to reduce noise. Using both R
T
and R
F
helps
minimize the impact of parasitic impedances.
The components were chosen to give this transfer function.
The 20
resistors isolate the amplifier outputs from capacitive
loading, but affect the response at very high frequencies only.
Figure 4 shows the nominal response simulated by SPICE; it
is very close to the ideal response.
DC LEVEL-SHIFTING
Figure 5 shows a DC-coupled, non-inverting amplifier that
level-shifts the input up to accommodate the desired output
voltage range. Given the desired signal gain (G), and the
amount V
OUT
needs to be shifted up (
V
OUT
) when V
IN
is at
the center of its range, the following equations give the
resistor values that produce the best DC offset:
NG = G +
V
OUT
/V
S
R
1
= R
4
/G
R
2
= R
4
/(NG – G)
R
3
= R
4
/(NG –1)
where:
NG = 1 + R
4
/R
3
(Noise Gain)
V
OUT
= (G)V
IN
+ (NG – G)V
S
1/2
OPA2634
V
OUT
V
IN
R
G
R
T
R
F
R
C
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