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參數(shù)資料
| 型號(hào)： | AD831APZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 混頻器 |
| 英文描述： | RF/MICROWAVE DOUBLE BALANCED MIXER |
| 文件頁(yè)數(shù)： | 16/16頁(yè) |
| 文件大?。?/td> | 550K |
| 代理商： | AD831APZ-REEL7 |
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AD831
–8–
AD831
–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 6), the gain
setting expression is
G
R
dB =
+
20
1
2
10
log
(2)
Figure 6. Output Amplifier Feedback Connections
for Increasing Gain
Driving Filters
The output amplifier can be used for driving reverse-terminated
loads. When driving an IF band-pass filter (BPF), for example,
proper attention must be paid to providing the optimal source
and load terminations so as to achieve the specified filter response.
The AD831’s wideband highly linear output amplifier affords an
opportunity to increase the RF to IF gain to compensate for a
filter’s insertion and termination losses.
Figure 7 indicates how the output amplifier’s low impedance
(voltage source) output can drive a doubly terminated band-pass
filter.The 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 signal
path between OUT and VFB should be as short as possible.
Figure 7. Connections for Driving a DoublyTerminated
Band-Pass Filter
Higher gains can be achieved, using different resistor ratios, but
with concomitant reduction in the bandwidth of this amplifier
(Figure 8). Note also that the Johnson noise of these gain setting
resistors, as well as that of the BPF terminating resistors, is ulti-
mately 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
1dB
COMPRESSION
POINT
(dBm)
8
6
4
2
G = 1
G = 2
G = 4
Figure 8. Output Amplifier 1 dB Compression
Point for Gains of 1, 2, and 4 (Gains of 0 dB, 6 dB,
and 12 dB, Respectively)
REV. C
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| AD8320ARP-REEL | 制造商:Analog Devices 功能描述:SP Amp Line Driver Amp Single 12V 20-Pin PSOP-II T/R |
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