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AD743BQ Fiches technique(PDF) 11 Page - Analog Devices

No de pièce AD743BQ
Description  Ultralow Noise BiFET Op Amp
Download  12 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD743BQ Fiches technique(HTML) 11 Page - Analog Devices

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AD743
REV. C
–11–
Figure 37b. An AC-Coupled, Low Noise
Hydrophone Amplifier
Figure 37c. A Hydrophone Amplifier Incorporating a
DC Servo Loop
Where the dc gain is 1 and the gain above the low frequency
cutoff (1/(2
πC
C(100 Ω))) is the same as the circuit of Figure
37a. The circuit of Figure 37c uses a dc servo loop to keep the
dc output at 0 V and to maintain full dynamic range for IB’s up
to 100 nA. The time constant of R7 and C2 should be larger
than that of R1 and CT for a smooth low frequency response.
The transducer shown has a source capacitance of 7500 pF. For
smaller transducer capacitances (
≤300 pF), lowest noise can be
achieved by adding a parallel RC network (R4 = R1, C1 = CT)
in series with the inverting input of the AD743.
BALANCING SOURCE IMPEDANCES
As mentioned previously, it is good practice to balance the
source impedances (both resistive and reactive) as seen by the
inputs of the AD743. Balancing the resistive components will
optimize dc performance over temperature because balancing
will mitigate the effects of any bias current errors. Balancing
input capacitance will minimize ac response errors due to the
amplifier’s input capacitance and, as shown in Figure 38, noise
performance will be optimized. Figure 39 shows the required
external components for noninverting (A) and inverting (B)
configurations.
Figure 38. RTI Voltage Noise vs. Input Capacitance
Figure 39. Optional External Components for Balancing Source Impedances


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