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APD-Slide8

An area where APD transient response is very important is in Gigabit Passive Optical Networks. These networks often require less than 100ns transient response for a 2 decade input current step. A couple of potential solutions are available to the designer. A discrete current mirror solution or the LT3571. The discrete current mirror has reduced parasitic capacitance on the signal path, but requires more board space and sacrifices accuracy. With the LT3571, the external component count is much lower and the part’s speed and performance specifications are well within the expected limits.

PTM Published on: 2011-05-13