An AC-Biased Microphone
I’ll round out the last of the things that caught my attention at this year’s ISSCC with a proposal and implementation of an AC-biased microphone. This is done based on projections that the biasing resistor for a traditional DC approach will head into ridiculously high territory – teraohms and higher.
The team, from NXP and Delft University, lists a number of problems that this causes.
- The connection between the MEMS die and the ASIC can easily pick up stray electrical noise due to its high impedance, meaning expensive packaging is … Read More → "An AC-Biased Microphone"