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參數(shù)資料
| 型號(hào)： | 5962-8963701CX |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | RMS TO DC CONVERTER, 0.15 MHz, CDIP14 |
| 封裝： | CERDIP-14 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大小： | 515K |
| 代理商： | 5962-8963701CX |
AD637
Rev. G | Page 8 of 20
FUNCTIONAL DESCRIPTION
FILTER/AMPLIFIER
24k
24k
ONE QUADRANT
SQUARER/DIVIDER
BUFFER
AMPLIFIER
Q1
Q2
Q3
Q4
125
6k
6k
12k
24k
A5
A1
A2
ABSOLUTE VALUE VOLTAGE –
CURRENT CONVERTER
I1
I3
I4
A4
A3
BIAS
Q5
CAV
+VS
RMS
OUT
COM
CS
DEN
INPUT
OUTPUT
OFFSET
dB
OUT
AD637
VIN
BUFF OUT
BUFF IN
–VS
00788-
002
14
1
13
10
4
6
5
3
7
9
11
8
Figure 4. Simplified Schematic
The AD637 embodies an implicit solution of the rms equation
that overcomes the inherent limitations of straightforward rms
computation. The actual computation performed by the AD637
follows the equation
=
ΙΝ
rms
V
Avg
rms
V
2
Figure 4 is a simplified schematic of the AD637, subdivided into
four major sections: absolute value circuit (active rectifier),
squarer/divider, filter circuit, and buffer amplifier. The input
voltage VIN, which can be ac or dc, is converted to a unipolar
current I1 by the active rectifier A1, A2. I1 drives one input of
the squarer/divider, which has the transfer function
3
1
4
I
2
=
The output current of the squarer/divider I4 drives A4, which
forms a low-pass filter with the external averaging capacitor.
If the RC time constant of the filter is much greater than the
longest period of the input signal, A4’s output is proportional to
the average of I4. The output of this filter amplifier is used by A3
to provide the denominator current I3, which equals Avg I4 and
is returned to the squarer/divider to complete the implicit rms
computation
ms
I
Avg
I
1
4
1
4
r
2
=
=
and
rms
V
IN
OUT =
If the averaging capacitor is omitted, the AD637 computes the
absolute value of the input signal. A nominal 5 pF capacitor
should be used to ensure stability. The circuit operates
identically to that of the rms configuration except that I3 is
now equal to I4, giving
4
2
1
4
I
I =
1
4
I
I =
The denominator current can also be supplied externally
by providing a reference voltage, VREF, to Pin 6. The circuit
operates identically to the rms case except that I3 is now
proportional to VREF. Therefore,
3
2
1
4
I
Avg
I =
and
DEN
IN
O
V
2
=
This is the mean square of the input signal.
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