Design Support

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Ionization detectors, as used in smoke alarms, output a very low current that requires a buffer amplifier to interface to the alarm circuitry. This requires a buffer amplifier with low input bias current, and, since a smoke detector is a "always-on " device, the amplifier must also have a very low quiescent current to maximize the battery life. This application note demonstrates the use of the LPV801 nanopower operational amplifier as the buffer amplifier in a common ionization chamber application.