Pulse width modulated amplifier
Patent 5594386 Issued on January 14, 1997. Estimated Expiration Date: 
April 21, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 21, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2915588 3038964 3294981 Pulse width modulated signal amplifier Current controlled two-state modulation Output stage for solid-state image pick-up device Rail-to-rail CMOS operational amplifier Class D amplifier Class-d BICMOS hearing aid output amplifier Patent #: 5247581 InventorAssigneeApplicationNo. 426391 filed on 04/21/1995US Classes:330/251, Including Class D amplifier330/253, Having field effect transistor381/312HEARING AIDS, ELECTRICALExaminersPrimary: Mottola, Steven J.Attorney, Agent or FirmInternational ClassesH03F 003/217H03F 003/45 H04R 025/00 AbstractA class-D pulse width modulated amplifier. The amplifier includes a current switch, an integrator and a comparator connected in a feedback loop. The feedback loop generates an ultrasonic frequency carrier which is utilized in the pulse width modulation of an audio input signal. In one embodiment a current switch and an audio input source are in electrical communication with an integrator. The output signal of the integrator is the input signal to a phase split differential output comparator having hysteresis. The differential output signals of the comparator are the input signals both to a load and to the current switch, thereby completing the feedback loop. In one embodiment the current switch includes compression circuitry.Other References
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