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Demonstration circuit 634 is a low noise avalanche photodiode (APD) bias supply featuring the LT1930A. This circuit takes an input voltage from 3V to 5.5V and provides 90V@2mA at the output (0V control voltage). The output voltage can be adjusted from 90V down to 30V by increasing the control voltage (4.5V max), which effectively changes the current into the feedback node to adjust the output voltage.

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