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參數(shù)資料
| 型號： | AD831 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Distortion Mixer |
| 中文描述： | 低失真混頻器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 225K |
| 代理商： | AD831 |
AD831
REV. B
–10–
T he RF input to the AD831 is shown connected by an imped-
ance matching network for an assumed source impedance of
50
. Figure 15 shows the input impedance of the AD831 plot-
ted vs. frequency. T he input circuit can be modeled as a resis-
tance in parallel with a capacitance. T he 82 pF capacitors (C
F
)
connected from IFN and IFP to VP provide a low-pass filter
with a cutoff frequency of approximately 140 MHz in down-
conversion applications (see the T heory of Operation section of
this data sheet for more details). T he LO input is connected
single-ended because the limiting amplifier provides a symmet-
ric drive to the mixer. T o minimize intermodulation distortion,
connect pins OUT and VFB by the shortest possible path. T he
connections shown are for unity-gain operation.
At LO frequencies less than 100 MHz, the AD831’s LO power
may be as low as –20 dBm for satisfactory operation. Above
100 MHz, the specified LO power of –10 dBm must be used.
51.1
110
IF
OUTPUT
R
T
BPF
R
T
NC
–5V
0.1μF
0.1μF
+5V
51.1
0.1μF
+5V
–5V
0.1μF
–5V
0.1μF
C2
L1
C1
RF
INPUT
C
F
82pF
C
F
82pF
0.1μF
+5V
IFN
VP
IFP
50
AP
GND
VN
RFP
RFN
VN
VP
9
LON
LOP
VP
12
GND
13
BIAS
VN
AD831
Top View
50
6
7
8
4
5
10
11
AN
VFB
COM
OUT
14
15
16
17
18
1
2
3
19
20
LO INPUT
–10 dBm
Figure 25. Connections for
±
5 V Dual-Supply Operation Showing Impedance
Matching Network and Gain of 2 for Driving Reverse-Terminated IF Filter
APPLICAT IONS
Careful component selection, circuit layout, power supply
decoupling, and shielding are needed to minimize the AD831’s
susceptibility to interference from radio and T V stations, etc. In
bench evaluation, we recommend placing all of the components
in a shielded box and using feedthrough decoupling networks
for the supply voltage.
Circuit layout and construction are also critical, since stray ca-
pacitances and lead inductances can form resonant circuits and
are a potential source of circuit peaking, oscillation, or both.
Dual-Supply Operation
Figure 25 shows the connections for dual supply operation.
Supplies may be as low as
±
4.5 V but should be no higher than
±
5.5 V due to power dissipation.
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