[Limpkin] styles circuits for a living. This board is one of his recent projects, as well as although his skills are light years ahead of our own experiences, he did a quite great task of describing exactly how he put this board together.
He was tasked with measuring the light intensity of two photodiodes. The expected impulses chosen up by those elements will be less than a nanosecond in duration, putting some special style restrictions upon him. To register this signal he’s utilizing three cascading op-amps per input. To ward off false readings from RF interference he likewise created in the protecting which you see surrounding the majority of the circuit.
His bundle option for the THS3202 op-amps is rather interesting. He didn’t opt for the footprint that includes a thermal pad to dissipate warm since he didn’t want to interrupt the ground airplane on the underside of the board. To keep the parts from melting he added an aluminum spacer that contacts the top of the package, then a warm sink that covers the entire shield frame. In a future revision he figures he’ll step to a four-layer board to ensure that the can select the MSOP bundle that does the work for him.
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