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參數(shù)資料
| 型號： | AD8330 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Cost DC-150 MHz Variable Gain Amplifier |
| 中文描述： | 低成本DC - 150 MHz的可變增益放大器 |
| 文件頁數(shù)： | 24/28頁 |
| 文件大?。?/td> | 681K |
| 代理商： | AD8330 |
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REV. A
–24–
AD8330
INPUT TO AD8330 – dBV
1.0
–50
–40
–20
0
L
0.8
0.7
0.6
0.5
–30
0.9
–10
Figure 22. AGC Output vs. Input Amplitude (Simulation)
The upper panel in Figure 23 shows time-domain output for 14
3 dB steps in input amplitude from 5.4 mV to 1.7 V. The wave-
forms in Figure 22 show the AGC voltage V
DBS
.
This simple detector exhibits a temperature variation in the
differential output amplitude of about 4 mV/
°
C. It provides a
fast attack time (an increase in the input is quickly leveled to the
nominal output, due to the high peak currents in Q1) and a slow
release time (a decrease in the input is not restored as quickly).
The voltage at the VDBS pin may be used as an RSSI output,
scaled 30 mV/dB. Note that the attack time can be halved by adding
a second transistor as shown in the box (Figure 21). For operation
at lower frequencies, the AGC hold capacitor must be increased.
Wide Range True RMS Voltmeter
The AD8362 is an rms-responding detector providing a dynamic
range of 60 dB from low frequencies to 2.7 GHz. This may be
increased to 110 dB using an AD8330 as a preconditioner, pro-
vided the noise bandwidth is limited by an interstage low-pass or
band-pass filter.
The VGA also provides an input port that is easier to drive
than the 200
input of the AD8362. Figure 24 shows the
general scheme.
Both the AD8330 and AD8362 provide linear-in-decibel control
interfaces. Thus when the output of the latter is used to control
the gain of the former, this functional form is unaffected. The
overall scaling is 33 mV/dB. Figure 25 shows the time domain
response using a loop filter capacitor of 10 nF, for inputs ranging
from 10
μ
V to 1 V rms, that is, a 100 dB measurement range.
TIME – s
0
G
–1
–2
1
0
–3
–4
3
2
10
20
30
40
50
60
70
80
90
100 110 120 130 140 150
0.75
0.50
1.25
1.00
0.25
1.75
1.50
0
V
DBS
OUTPUT
Figure 23. Time Domain Waveforms (Simulation)
(See Text)
OFST
ENBL
CNTR
VPOS
VPS1
VPSO
INHI
OPHI
INLO
OPLO
MODE
CMOP
VMAG
COMM
CMGN
VDBS
AD8330
COMM
CHPF
DECL
INHI
INLO
DECL
PWDN
COMM
1
2
3
4
5
6
7
8
ACOM
VREF
VTGT
VPOS
VOUT
VSET
ACOM
CLPF
16
15
14
13
12
11
10
9
AD8362
10 F
VOUT
6.04k
4.02k
C
18nF
3.6V
3.6V
10 F
3.3
3.3
5V
3.3
0.1 F
0.1 F
0.1 F
0.1 F
0.1 F
INPUT
Figure 24. Wide Range True RMS Voltmeter (Preliminary)
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