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AD8331 датащи(PDF) 9 Page - Analog Devices

номер детали AD8331
подробное описание детали  Ultralow Noise VGAs with Preamplifier and Programmable RIN
PDF  32 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

AD8331 датащи(HTML) 9 Page - Analog Devices

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AD8331/AD8332
Rev. C | Page 9 of 32
50.5
GAIN SCALING FACTOR
0
50.4
49.6
49.7
49.8
49.9
50.0
50.1
50.2
50.3
5
25
20
15
10
35
SAMPLE SIZE = 100
0.2V < VGAIN < 0.7V
30
Figure 15. Gain Scaling Factor Histogram
100
100k
1M
10
1
0.1
10M
100M
FREQUENCY (Hz)
SINGLE ENDED, PIN VOH OR VOL
RL = ∞
Figure 16. Output Impedance vs. Frequency
FREQUENCY (Hz)
100
1k
10
10k
1M
100k
100M
10M
RFB = ∞, CSH = 0pF
RFB = 270Ω, CSH = 22pF
RFB = 412Ω, CSH = 12pF
RFB = 549Ω, CSH = 8.2pF
RFB = 3.01kΩ, CSH = 0pF
RFB = 6.65kΩ, CSH = 0pF
RFB = 1.1kΩ, CSH = 1.2pF
Figure 17. LNA Input Impedance vs. Frequency for
Various Values of RFB and CSH
0
Ω
17
Ω
25j
–25j
50j
–50j
100j
–100j
f = 100kHz
RIN = 50Ω
RFB = 270Ω
RIN = 75Ω,
RFB = 412Ω
RIN = 100Ω,
RFB = 549Ω
,
RIN = 200Ω,
RFB = 1.1kΩ
RIN = 6kΩ,
RFB = ∞
Figure 18. Smith Chart, S11 vs. Frequency, 0.1 MHz to 200 MHz
for Various Values of RFB
1G
FREQUENCY (Hz)
10M
100k
–10
–5
0
5
20
10
15
100M
1M
–20
–15
RIN = 50Ω, 75Ω,
AND 100
Ω
RIN = 200Ω
RIN = 200Ω
RIN = 500Ω
RIN = 1kΩ
Figure 19. LNA Frequency Response,
Single-Ended, for Various Values of RIN
1G
FREQUENCY (Hz)
10M
100k
–10
–5
0
5
20
10
15
100M
1M
–20
–15
RFB = ∞
Figure 20. LNA Frequency Response, Unterminated, Single-Ended



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