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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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OPA607 датащи(PDF) 29 Page - Texas Instruments |
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OPA607 датащи(HTML) 29 Page - Texas Instruments |
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29 / 50 page  Case1: 200 Case2: 2 k E O + ± V S+ = 5V V S- = -5V R S R G R F Case1: 250 Case2: 2.5 k Case1: 1 k Case2: 10 k ( ) 2 2 2 BI F F N NI BN S S I R 4kTR E E I R 4kTR NG NG æ ö = + + + + ç ÷ è ø 29 OPA810 www.ti.com SBOS799A – AUGUST 2019 – REVISED DECEMBER 2019 Product Folder Links: OPA810 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Application Information (continued) Dividing this expression by the noise gain (NG = 1 + RF / RG) shows the equivalent input referred spot noise voltage at the noninverting input; see Equation 8. (8) Substituting large resistor values into Equation 8 can quickly dominate the total equivalent input referred noise. A source impedance on the noninverting input of 2-kΩ adds a Johnson voltage noise term similar to that of the amplifier (6.3 nV/ √Hz). Table 1 compares the noise contributions from the various terms when the OPA810 is configured in a noninverting gain of 5 V/V as Figure 72 shows. Two cases are considered where the resistor values in case 2 are 10x the resistor values in case 1. The total output noise in case 1 is 34 nV/ √Hz while the noise in case 2 is 51.5 nV/ √Hz. The large value resistors in case 2 dilute the benefits of selecting a low noise amplifier like the OPA810. To minimize total system noise, reduce the size of the resistor values. This increases the amplifiers output load and results in a degradation of distortion performance. The increased loading increases the dynamic power consumption of the amplifier. The circuit designer must make the appropriate tradeoffs to maximize the overall performance of the amplifier to match the system requirements. Figure 72. Comparing Noise Contributors for Two Cases With the Amplifier in a Noninverting Gain of 5 V/V Table 1. Comparing Noise Contributions for the Circuit in Figure 72 NOISE SOURCE OUTPUT NOISE EQUATION CASE 1 CASE 2 NOISE SOURCE VALUE VOLTAGE NOISE CONTRIBUTI ON (nV/ √Hz) NOISE POWER CONTRIBUTI ON (nV2/Hz) CONTRIBUTI ON (%) NOISE SOURCE VALUE VOLTAGE NOISE CONTRIBUTI ON (nV/ √Hz) NOISE POWER CONTRIBUTI ON (nV2/Hz) CONTRIBUTI ON (%) Source resistor, RS ERS (1 + RF /RG) 1.82 nV/ √Hz 9.1 82.81 7.15 5.76 nV/ √Hz 28.8 829.44 31.29 Gain resistor, RG ERG (RF / RG) 2.04 nV/ √Hz 8.16 66.59 5.75 6.44 nV/ √Hz 25.76 663.58 25.03 Feedback resistor, RF ERF 4.07 nV/ √Hz 4.07 16.57 1.43 12.87 nV/ √Hz 12.87 165.64 6.25 Amplifier voltage noise, ENI ENI (1 + RF / RG) 6.3 nV/ √Hz 31.5 992.25 85.67 6.3 nV/ √Hz 31.5 992.25 37.43 Inverting current noise, IBI IBI (RF || RG) 5 fA/ √Hz 5.0E-3 — — 5 fA/ √Hz 50E-3 — — Noninverting current noise, IBN IBNRS (1 + RF/ RG) 5 fA/ √Hz 1.0E-3 — — 5 fA/ √Hz 10E-3 — — |
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