Abstract
Electret microphones are very common in mobile devices, but are invariably single-ended in configuration. For moderate dynamic conditions this is not a problem, but under high-sound pressure levels, better linearity can be obtained using a push-pull arrangement. Recent progress in nano-porous electret materials also opens up possibilities for electret loudspeakers. Such loudspeakers would offer potential benefits such as high-conversion efficiency, no magnetic field, and an ultra-thin package. However, there are product integration challenges. The authors describe a simulation model of a push-pull electret transducer and discuss the conditions under which it is linear. It turns out that the relationship with a non-electret electrostatic transducer is relatively simple.
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