AD8331 datasheet(9/32 Pages) AD

9 / 32 page

AD8331/AD8332

Rev. C | Page 9 of 32

50.5

GAIN SCALING FACTOR

50.4

49.6

49.7

49.8

49.9

50.0

50.1

50.2

50.3

SAMPLE SIZE = 100

0.2V < VGAIN < 0.7V

Figure 15. Gain Scaling Factor Histogram

100

100k

0.1

10M

100M

FREQUENCY (Hz)

SINGLE ENDED, PIN VOH OR VOL

RL = ∞

Figure 16. Output Impedance vs. Frequency

FREQUENCY (Hz)

100

10k

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

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

FREQUENCY (Hz)

10M

100k

–10

–5

100M

–20

–15

RIN = 50Ω, 75Ω,

AND 100

Ω

RIN = 200Ω

RIN = 500Ω

RIN = 1kΩ

Figure 19. LNA Frequency Response,

Single-Ended, for Various Values of RIN

FREQUENCY (Hz)

10M

100k

–10

–5

100M

–20

–15

RFB = ∞

Figure 20. LNA Frequency Response, Unterminated, Single-Ended

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