Delta-sigma modulation microphone sensors using microwave cavity resonator

作者：Maezawa K^*; Fujino S; Yamaoka T; Mori M

来源：Electronics Letters, 2016, 52(20): 1651-1652.

DOI：10.1049/el.2016.2538

• microphones
• sensors
• microwave resonators
• cavity resonators
• delta-sigma modulation
• analogue-digital conversion
• membranes
• fast Fourier transforms
• microwave frequency convertors
• delta-sigma modulation microphone sensor
• microwave cavity resonator
• frequency delta-sigma modulation technique
• FDSM technique
• analogue-to-digital conversion technique
• digital signal
• precision analogue component
• movable membrane
• heterojunction fast Fourier transformation
• sound-frequency converter

The frequency delta-sigma modulation (FDSM) technique was applied to the microphone sensors. The FDSM is a superior analogue-to-digital conversion technique, which outputs wide band, large dynamic range digital signals without precision analogue components. In this implementation, a microwave cavity resonator having movable membrane on its one end, together with a gain block consisting of a heterojunction field effect transistor, was used for sound-frequency converter. The output of this converter (frequency modulated intermediate signal) was sampled and converted to 1-bit delta sigma modulated digital signals. The noise shaping behaviour with a clear signal peak was demonstrated for the fabricated devices.

• 出版日期2016-9-29