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OPA607 датащи(PDF) 31 Page - Texas Instruments |
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OPA607 датащи(HTML) 31 Page - Texas Instruments |
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31 / 50 page ![]() Frequency (Hz) -10 0 10 20 30 40 50 60 70 80 90 100 110 120 100 1k 10k 100k 1M 10M 100M D804 AOL 1/E AOLE Frequency (Hz) 0 10 20 30 40 50 60 70 80 90 100 100 1k 10k 100k 1M 10M 100M D805 AOL 1/E AOLE 31 OPA810 www.ti.com SBOS799A – AUGUST 2019 – REVISED DECEMBER 2019 Product Folder Links: OPA810 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated Equation 10 estimates a closed-loop bandwidth of 2.19 MHz. Figure 74 and Figure 75 show the loop-gain magnitude and phase plots from the TINA-TI simulations of the transimpedance amplifier circuit of Figure 73. The 1/β gain curve has a zero from RF and CIN at 70 kHz and a pole from RF and CF cancelling the 1/β zero at 1.5 MHz, resulting in a 20-dB per decade rate-of-closure at the loop-gain crossover frequency (the frequency where AOL equals 1/β), ensuring a stable circuit. A phase margin of 62° is obtained with a closed-loop bandwidth of 3 MHz and a 100-kΩ transimpedance gain. 9.2.1.3 Application Curves Figure 74. Loop-Gain Magnitude vs Frequency for the Transimpedance Amplifier Circuit of Figure 73 Figure 75. Loop-Gain Phase vs Frequency for the Transimpedance Amplifier Circuit of Figure 73 |
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