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(More customer reviews)This book lives up to its title by giving a thorough review of photodiodes driving op-amps. It does not consider specialized, discrete photodiode amplifiers. By limiting the coverage to op-amps, the bandwidths are necessarily those of op-amps, a few tens of megahertz at the time most of the book was written, perhaps 100 MHz or so today. Truly wide bandwidth solutions (GHz) are left to the imagination of the reader.
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Light photons impinging upon a semiconductor material in the vicinity of a P-N junction release conduction carriers to produce current flow through the photodiode effect. Photodiode amplifiers convert thiscurrent to a voltage in a relationship that remains linear as long as the amplifier eliminates signal voltage swing from the photodiode. For this purpose, the simple current-to-voltage converter or transimpedance amplifier presents a virtual ground to the diode. However, when connected to a photodiode, this simple op amp circuit displays surprising multidimensional constraints that defy conventional op amp intuition.
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