Abstract: An electronic device, comprises a display and an expandable enclosure positioned opposite the display. The expandable enclosure is operable between at least a closed configuration and an open configuration, such that in the open configuration, the expandable enclosure defines faces of a resonance box. One or more speakers include a speaker cone and a drive magnet assembly. Each of the one or more speakers is positioned on an outer surface of the expandable enclosure and oriented so that the drive magnet assembly faces an interior of the resonance box, and so that the speaker cone faces an exterior of the resonance box. In this way, the electronic device gains the benefit of amplifying audio via the resonance box without adding significantly to the device volume or requiring an auxiliary speaker system.

Abstract: An electronic device, comprises a display and an expandable enclosure positioned opposite the display. The expandable enclosure is operable between at least a closed configuration and an open configuration, such that in the open configuration, the expandable enclosure defines faces of a resonance box. One or more speakers include a speaker cone and a drive magnet assembly. Each of the one or more speakers is positioned on an outer surface of the expandable enclosure and oriented so that the drive magnet assembly faces an interior of the resonance box, and so that the speaker cone faces an exterior of the resonance box. In this way, the electronic device gains the benefit of amplifying audio via the resonance box without adding significantly to the device volume or requiring an auxiliary speaker system.

Abstract: A continuous time sigma delta modulator for use in a continuous time sigma delta analog to digital converter is described. The modulator comprises a sequence of integration stages and a quantizer arranged to receive an output from the last integration stage in the sequence. Each integration stage comprises an integrator circuit that in turn comprises an amplifier and the sequence of integration stages comprises a pair of integration stages. The pair of integration stages further comprises a shared current steering DAC and wherein the amplifier in the integrator circuit in a first of the pair of integration stages forms part of a current steering circuit for the second of the pair of integration stages and the amplifier in the integrator circuit in the second of the pair of integration stages forms part of a current steering circuit for the first of the pair of integration stages.