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Using the LDM-4984 with the LDP-3840B

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Using the LDM-4984 with the LDP-3840B

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In order to obtain low overshoot with good pulse shapes the ILX Lightwave LDP-3840B Pulsed Current Source uses an external laser diode mounting board, LPB-380 to improve impedance matching. The nominal output impedance of the LDP-3840B is 3Ω; the LPB-380 uses tuning resistors to match the output load to the 3Ω of the LDP-3840B. The standard configuration for the LPB-380 is five 1Ω resistors in parallel that give an effective tuning resistance of 0.2Ω on the output. While pulse shapes improve with this arrangement, connecting the LDP-3840B to an ILX standard laser diode mount becomes more difficult. This technical note will explore different approaches to connecting to a standard LDM4984 while optimizing the pulse shape.

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