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參數(shù)資料
| 型號(hào)： | 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)： | 9/16頁 |
| 文件大?。?/td> | 225K |
| 代理商： | AD831 |
AD831
REV. B
–9–
For gains other than unity, the amplifier’s output at OUT is
connected via an attenuator network to VFB; this determines
the overall gain. Using resistors R1 and R2 (Figure 22), the gain
setting expression is
G
dB
=
20 log
10
R
1
+
R
2
R
2
Equation 2
R2
R1
IF
OUTPUT
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
Figure 22. Output Amplifier Feedback Connections for
Increasing Gain
Driving Filters
T he output amplifier can be used for driving reverse-terminated
loads. When driving an IF bandpass
filter
(BPF), for example,
proper attention must be paid to providing the optimal source
and load terminations so as to achieve the specified filter re-
sponse. T he AD831’s wideband highly linear output amplifier
affords an opportunity to increase the RF-to-IF gain to compen-
sate for a filter’s insertion and termination losses.
Figure 23
indicates how the output amplifier’s low impedance
(voltage source) output can drive a doubly-terminated bandpass
filter. T he typical 10 dB of loss (4 dB of insertion loss and 6 dB
due to the reverse-termination) be made up by the inclusion of a
feedback network that increases the gain of the amplifier by
10 dB (
×
3.162). When constructing a feedback circuit, the sig-
nal path between OUT and VFB should be as short as possible.
R2
51.1
R1
110
IF
OUTPUT
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
R
T
BPF
R
T
Figure 23. Connections for Driving a Doubly-Terminated
Bandpass Filter
Higher gains can be achieved, using different resistor ratios, but
with concomitant reduction in the bandwidth of this amplifier
(Figure 24
)
. Note also that the Johnson noise of these gain-set-
ting resistors, as well as that of the BPF terminating resistors, is
ultimately reflected back to the mixer’s input; thus they should
be as small as possible, consistent with the permissible loading
on the amplifier’s output.
FREQUENCY – MHz
12
10
0
10
1000
100
1
8
6
4
2
G = 1
G = 2
G = 4
Figure 24. Output Amplifier 1 dB Compression Point for
Gains of 1, 2, and 4 (Gains of 0 dB, 6 dB, and 12 dB,
Respectively)
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