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ADA4817-2ACPZ-R7 データシート(PDF) 26 Page - Analog Devices

部品番号 ADA4817-2ACPZ-R7
部品情報  Low Noise, 1 GHz FastFET Op Amps
PDF  29 Pages
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メーカー  AD [Analog Devices]
ホームページ  http://www.analog.com
Logo AD - Analog Devices

ADA4817-2ACPZ-R7 データシート(HTML) 26 Page - Analog Devices

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Data Sheet
ADA4817-1/ADA4817-2
APPLICATIONS INFORMATION
analog.com
Rev. H | 26 of 29
HIGH SPEED JFET INPUT INSTRUMENTATION
AMPLIFIER
Figure 66 shows an example of a high speed instrumentation ampli-
fier with a high input impedance using the ADA4817-1/ADA4817-2.
The dc transfer function is
VOUT= VN−VP 1+2RFRG
(15)
For G = 1, it is recommended that the feedback resistors for the two
preamps be set to 0 Ω and the gain resistor be open.
The system bandwidth for G = 1 is 400 MHz. For gains higher than
2, the bandwidth is set by the preamp, and it can be approximated
by
In-amp−3 dB = (fCR × RG)/(2 × RF)
(16)
The match of resistor ratios, R1:R2 to R3:R4, primarily determine
the common-mode rejection of the in-amp and it is estimated by
VOVCM
= δ1−δ21+δ1δ2
(17)
The summing junction impedance for the preamps is equal to RF
|| 0.5(RG). Keep this value relatively low to improve the bandwidth
response like in the previous example.
Figure 66. High Speed Instrumentation Amplifier



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