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US 6,087,968 AGranted
Analog to digital converter comprising an asynchronous sigma delta modulator and decimating digital filter
AssigneeU.S. Philips Corporation
InventorEngel Roza
Life of this patent
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Abstract
An analog to digital converter comprises an asynchronous sigma-delta modulator generating an asynchronous duty cycle modulated square wave, sampling means to synchronously sample the asynchronous square wave and a decimating digital filter to convert the samples from the sampling means into a desired PCM-format.
Claims6
An analog to digital converter comprising:
- an asynchronous sigma-delta modulator coupled to the input of the analog to digital converter for modulating an amplitude of an input signal and comprising a comparator which is not switched by an externally applied clock signal, said asynchronous sigma-delta modulator being configured to generate an asynchronous duty cycle modulated signal as an output;
- a decimating digital filter;
- and
- a clock-controlled sampler coupled between the asynchronous sigma-delta modulator and the decimating digital filter.
1 more element
Dependencies are inferred from the claim text.