Suppression of Switch Mode Power Supply Noise in Digital Microphones
A digital microphone has a high power consumption compared to an analog. This will result in a higher working temperature, especially if traditional linear regulators are used in the microphone power supply circuitry. For a better degree of power efficiency, a switch mode power supply can be used instead. A switch mode power supply will however add noise. If the pulse width modulator is synchronised to the analog-to-digital converter sample rate clock, the switch mode power supply noise decreases by elimination of the alias frequencies.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.