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參數(shù)資料
| 型號(hào)： | AD606 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 50 MHz, 80 dB Demodulating Logarithmic Amplifier with Limiter Output(50MHz,帶限幅輸出80dB解調(diào)對(duì)數(shù)放大器) |
| 中文描述： | 50兆赫，80分貝限解調(diào)與輸出（50MHz時(shí)，帶限幅輸出80dB的對(duì)數(shù)放大器，解調(diào)對(duì)數(shù)放大器） |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 474K |
| 代理商： | AD606 |
AD606
REV. 0
–9–
Low Frequency Applications
With reasonably sized input coupling capacitors and an optional
input low-pass filter, the AD606 can operate to frequencies as
low as 200 Hz with good log conformance. Figure 8 shows the
schematic, with the low-pass filter included in the dashed box.
This circuit should be built inside a die cast box and the signal
brought in through a coaxial connector. The circuit must also
have a low-pass filter to reject the attenuated RF signals that
would otherwise be rectified along with the desired signal and
be added to the log output. The shielded and filtered circuit has
a 90 dB dynamic range, as shown in Figure 9.
In this circuit, R4 and R5 form a 20 dB attenuator that extends
the input range to 10 V rms. R3 isolates loads from VLOG. Ca-
pacitors C1 and C2 (4.7
μ
F each), R1, R2, and the AD606’s in-
put resistance of 2.5 k
form a 100 Hz high-pass filter that is
before the AD606; the corner frequency of this filter must be
well below the lowest frequency of interest. In addition, the
offset-correction loop introduces another pole at low signal lev-
els that is transformed into another high-pass filter because it is
in a feedback path. This indicates that there has to be a gradual
transition from a 40 dB roll off at low signal levels to a 20 dB
roll off at high signal levels, at which point the feedback low
pass filter is effectively disabled since the incoming signal
swamps the feedback signal.
This low-pass filter introduces some attenuation due to R1 and
R2 in conjunction with the 2.5 k
input resistance of the
AD606. To minimize this effect, the value of R1 and R2 should
be kept as small as possible–100
is a good value since it bal-
ances the need to reduce the attenuation as mentioned above
with the requirement for R1 and R2 to be much larger then the
impedance of C1 and C2 at the low-pass corner frequency, in
our case about 1 MHz.
4
–80
40
3
1
–60
2
0
20
–20
–40
INPUT SIGNAL – dBm
V
0
1kHz – 10MHz
100Hz
90dB
3.5V
Figure 9. Performance of Low Frequency Circuit at 100 Hz
and 1 kHz to 10 MHz (Note Attenuation)
R3
1k
C4
4.7
μ
F
TO
DVM
0.1
μ
F
+5V
7
8
1
2
3
4
5
6
9
10
15
16
14
13
I
V
I
I
C
B
O
L
L
F
F
V
P
C
I
L
12
11
AD606JN
NC
NC
NC
R5
51.1
AC
INPUT
C1
4.7
μ
F
C2
4.7
μ
F
R1
100
R2
100
C3
680pF
R4
453
LOW-PASS
FILTER
DIECAST BOX
20dB
ATTENUATOR
Figure 8. Circuit for Low Frequency Measurements
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