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AD743BQ Fiches technique(PDF) 11 Page - Analog Devices |
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AD743BQ Fiches technique(HTML) 11 Page - Analog Devices |
11 / 12 page 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 |
Numéro de pièce similaire - AD743BQ |
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Description similaire - AD743BQ |
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