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OPA320AQDBVRQ1 Datasheet(PDF) 18 Page - Texas Instruments |
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OPA320AQDBVRQ1 Datasheet(HTML) 18 Page - Texas Instruments |
18 / 34 page OPA320-Q1 V O V (V+) R 10 M (FB) C < 1pF (FB) (1) l +V (BIAS) (–3 dB) (FB) (D) GBW ƒ 2 R C = ´ p ´ ´ (FB) (FB) (FB) (D) 1 GBW 2 R C 4 R C = ´ p ´ ´ ´ p ´ ´ 18 OPA320-Q1, OPA2320-Q1 SLOS884A – SEPTEMBER 2014 – REVISED DECEMBER 2016 www.ti.com Product Folder Links: OPA320-Q1 OPA2320-Q1 Submit Documentation Feedback Copyright © 2014–2016, Texas Instruments Incorporated 8.2.1.2 Detailed Design Procedure To achieve a maximally-flat, second-order Butterworth frequency response, the feedback pole should be set to: (2) Use Equation 3 to calculate the bandwidth. (3) For even higher transimpedance bandwidth, consider the high-speed CMOS OPA380 (90-MHz GBW), OPA354 (100-MHz GBW), OPA300 (180-MHz GBW), OPA355 (200-MHz GBW), or OPA656 and OPA657 (400-MHz GBW). For single-supply applications, the +INx input can be biased with a positive DC voltage to allow the output to reach true zero when the photodiode is not exposed to any light, and respond without the added delay that results from coming out of the negative rail; this configuration is shown in Figure 37. This bias voltage also appears across the photodiode, providing a reverse bias for faster operation. (1) C(FB) is optional to prevent gain peaking. C(FB) includes the stray capacitance of R(FB). Figure 37. Single-Supply Transimpedance Amplifier For additional information, refer to the application bulletin from TI, Compensate Transimpedance Amplifiers Intuitively (SBOA055). 8.2.1.2.1 Optimizing The Transimpedance Circuit To achieve the best performance, components should be selected according to the following guidelines: 1. For lowest noise, select R(FB) to create the total required gain. Using a lower value for R(FB) and adding gain after the transimpedance amplifier generally produces poorer noise performance. The noise produced by R(FB) increases with the square-root of R(FB), whereas the signal increases linearly. Therefore, signal-to-noise ratio improves when all the required gain is placed in the transimpedance stage. 2. Minimize photodiode capacitance and stray capacitance at the summing junction (inverting input). This capacitance causes the voltage noise of the op amp to be amplified (increasing amplification at high frequency). Using a low-noise voltage source to reverse-bias a photodiode can significantly reduce the capacitance. Smaller photodiodes have lower capacitance. Use optics to concentrate light on a small photodiode. 3. Noise increases with increased bandwidth. Limit the circuit bandwidth to only that required. Use a capacitor across the R(FB) to limit bandwidth, even if not required for stability. |
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