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OPA355 Datasheet(PDF) 12 Page - Texas Instruments |
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OPA355 Datasheet(HTML) 12 Page - Texas Instruments |
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12 / 26 page ![]() OPA381 OPA2381 SBOS313B − AUGUST 2004 − REVISED NOVEMBER 2004 www.ti.com 12 120 100 80 60 40 20 0 −20 Frequency (Hz) 100 10k 1k 1M 10M 100k 100M −3dB at 200kHz SeeFigure6a C DIODE = 10pF SeeFigure6c SeeFigure6b Figure 7. Transimpedance Gains for Circuits in Figure 6 The effects of these circuit configurations on output noise are shown in Figure 8 and on integrated output noise in Figure 9. A 2-pole Butterworth filter (maximally flat in passband) is created by selecting the filter values using the equation: C FRF + 2C FILTERRFILTER The circuit in Figure 6b rolls off at 20dB/decade. The circuit with the additional filter shown in Figure 6c rolls off at 40dB/decade, resulting in improved noise performance. 400 300 200 100 0 Frequency (Hz) 100 1k 10k 1M 10M 100k 100M SeeFigure6a SeeFigure6b See Figure 6c C DIODE = 10pF Figure 8. Output Noise for Circuits in Figure 6 500 400 300 200 100 0 Frequency (Hz) 100 10k 1k 1M 10M 100k 100M C DIODE = 10pF SeeFigure6a SeeFigure6b See Figure 6c 310 µVrms 68 µVrms 25 µVrms Figure 9. Integrated Output Noise for Circuits in Figure 6 Figure 10 shows the effects of diode capacitance on integrated output noise, using the circuit in Figure 6c. For additional information, refer to Noise Analysis of FET Transimpedance Amplifiers (SBOA060), and Noise Analysis for High Speed Op Amps (SBOA066), available for download from the TI web site. 60 50 40 30 20 10 0 Frequency (Hz) 1 100 10 10k 1k 1M 10M 100k 100M See Figure 6c C DIODE = 100pF C DIODE =50pF C DIODE = 20pF C DIODE =1pF C DIODE = 10pF 37 µVrms 28 µVrms 25 µVrms 23 µVrms 56 µVrms Figure 10. Integrated Output Noise for Various Values of CDIODE for Circuit in Figure 6c (4) |
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