参数资料
| 型号： | OP497GSZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 500KHZ QUAD 16SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 转换速率： | 0.15 V/µs |
| 增益带宽积： | 500kHz |
| 电流 - 输入偏压： | 60pA |
| 电压 - 输入偏移： | 80µV |
| 电流 - 电源： | 525µA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | ±2 V ~ 20 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
OP497
Rev. E | Page 13 of 16
NONLINEAR CIRCUITS
Due to its low input bias currents, the OP497 is an ideal log
amplifier in nonlinear circuits, such as the squaring amplifier
and square root amplifier circuits shown in Figure 40 and
as an example, the analysis begins by writing a voltage loop
equation across Transistors Q1, Q2, Q3, and Q4.
+
=
+
S4
REF
T4
S3
O
T3
S2
IN
T2
S1
IN
T1
I
In
V
I
In
V
I
In
V
I
In
V
All the transistors in the MAT04 are precisely matched and at
the same temperature; therefore, the IS and VT terms cancel,
giving
2InIIN
= InIO + InIREF = In (IO × IREF)
Exponentiating both sides of the thick equation lead to
()
REF
IN
O
I
2
=
Op amp A2 forms a current-to-voltage converter which results
in VOUT = R2 × IO. Substituting (VIN/R1) for IIN and the previous
equation for IO yields
2
=
R1
V
I
R2
V
IN
REF
OUT
1
2
3
6
7
5
C1
100pF
V+
2
3
8
1
4
V–
6
5
7
IO
9
8
10
Q1
Q3
Q2
14
12
Q4
13
IREF
MAT04
1/4
OP497
1/4
OP497
A2
A1
IIN
VIN
R1
133k
–15V
R3
50k
R4
50k
C2
100pF
R2
33k
VOUT
00
30
9-
0
41
Figure 40. Squaring Amplifier
A similar analysis made for the square root amplifier circuit in
Figure 41 leads to its transfer function
( )(
)
R1
I
V
R2
V
REF
IN
OUT =
In these circuits, IREF is a function of the negative power supply. To
maintain accuracy, the negative supply should be well regulated.
For applications where very high accuracy is required, a voltage
reference can be used to set IREF. An important consideration for
the squaring circuit is that a sufficiently large input voltage can
force the output beyond the operating range of the output op
amp. Resistor R4 can be changed to scale IREF, or R1 and R2 can
be varied to keep the output voltage within the usable range.
1
2
3
6
7
5
V+
2
3
8
1
4
6
5
7
IO
9
8
10
Q1
Q3
Q2
14
12
Q4
13
MAT04
C2
100pF
1/4
OP497
1/4
OP497
VOUT
R2
33k
IREF
IIN
C1
100pF
–15V
V–
R5
2k
R3
50k
R4
50k
VIN
R1
33k
0
03
09
-0
42
Figure 41. Square Root Amplifier
Unadjusted accuracy of the square root circuit is better than
0.1% over an input voltage range of 100 mV to 10 V. For a similar
input voltage range, the accuracy of the squaring circuit is better
than 0.5%.
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