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OPA1644AIDR Datasheet(PDF) 11 Page - Texas Instruments |
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OPA1644AIDR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page R 1 R 2 E O R 1 R 2 E O R S V S R S V S A)NoiseinNoninvertingGainConfiguration B)NoiseinInvertingGainConfiguration Noiseattheoutput: Wheree = S 4kTR S 4kTR 1 4kTR 2 =thermalnoiseofR S =thermalnoiseofR 1 =thermalnoiseofR 2 e = 1 e = 2 Noiseattheoutput: E = O 2 1+ R 2 R +R 1 S R 2 R +R 1 S 2 2 2 Wheree = S 4kTR S 4kTR 1 4kTR 2 =thermalnoiseofR S =thermalnoiseofR 1 =thermalnoiseofR 2 e = 1 e = 2 R 2 R +R 1 S 2 1+ R 2 R 1 1+ R 2 R 1 2 R 2 R 1 2 e +e + 1 2 2 2 E = O 2 e + n 2 e s 2 FortheOPA164xseriesopampsat1kHz,e =5.1nV/ Hz n Ö e +e + 1 2 2 2 e s 2 e + n 2 OPA1641 OPA1642 OPA1644 www.ti.com SBOS484 – DECEMBER 2009 Figure 32 illustrates both noninverting (A) and The feedback resistor values can generally be inverting (B) op amp circuit configurations with gain. chosen to make these noise sources negligible. Note In circuit configurations with gain, the feedback that low impedance feedback resistors will load the network resistors also contribute noise. In general, output of the amplifier. The equations for total noise the current noise of the op amp reacts with the are shown for both configurations. feedback resistors to create additional noise space components. However, the extremely low current noise of the OPA164x means that its current noise space contribution can be neglected. Figure 32. Noise Calculation in Gain Configurations Copyright © 2009, Texas Instruments Incorporated 11 Product Folder Link(s): OPA1641 OPA1642 OPA1644 |
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