Photodiodes are used in a wide variety of applications to transform light into a current or voltage. These range from solar cells to optical data networks, from precision instruments to chromatography to medical imaging. All of these applications share a need for circuitry to buffer and scale the photodiode output. For applications requiring high speed and high dynamic range, transimpedance amplifier (TIA) circuits like the one shown in Fig. 1 are often used. In this figure, the feedback capacitance is shown as parasitic. For many applications, this is a deliberately placed capacitor to ensure stability.
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