To All, Looks like a very successful (Amplifier Shaper) prototype ! We measured the epected 35mW per channel power dissipation. Shape looks good ( nothing but a paper printer on the scope) Here are the first measurements with all default switch settings: We used an old Lecroy Scope for the pulse measurements and found some variation in measurement repeatability so some of the variation in the table may simply be hookup or scope related. The output of the chip is a current and has been modeled with a 62ohm per side load. The scope measurements were made using a MiniCircuit T1-1 transformer between the outputs with the other side connected to a 50 ohm terminated cable. This presents a load to the A and B outputs of 25 ohms each to virtual ground, so the raw data below is in the column labeled 25 ohms, and we simply scaled to get the expected differential voltage across the intended 62 ohm load resistors. -Mitch ( with significant help from Godwin Mayers who wired up the test socket and a talented summer student, Kurt Brendlinger from Yale.) Preliminary Pulse Measurements on the GAS-1 Chip: Ain --> negative impulse input Bin --> positive impulse input
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