Hybrid delta-sigma ADC
AssigneeAsahi Kasei Microdevices Corporation
InventorsKoichi Hamashita, Gábor C Temes, Yan Wang
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Abstract
A hybrid delta sigma ADC architecture and method is disclosed to implement a high-resolution delta-sigma modulator with a single-bit output. The system contains a low-order multi-bit analog noise-shaping loop, followed by a high-order single-bit digital modulator. The combination simplifies the analog modulator, and allows the use of most of the full-scale input range.
Claims26
A hybrid delta sigma analog to digital converter system comprising:
- an analog loop comprising a low-order analog delta-sigma modulator;
- and
- a digital loop comprising a higher-order single-bit digital delta-sigma modulator operably coupled to said analog loop.
A one-bit digital output microphone system comprising:
- a microphone;
- an amplifier operatively coupled to said microphone;
- a low-order analog delta-sigma modulator operatively coupled to said amplifier;
- and
- a higher-order single-bit digital delta-sigma modulator operably coupled to said low-order analog delta-sigma modulator.
A method for performing a hybrid delta sigma analog to digital conversion comprising the steps of:
- receiving an analog signal;
- processing said analog signal in a low-order analog delta-sigma modulator in an analog loop;
- attenuating output of said low-order analog delta-sigma modulator in a digital loop;
- filtering in said digital loop said attenuated output of said low-order analog delta-sigma modulator to produce a filtered signal;
- and
- generating in a higher-order single-bit digital delta-sigma modulator in said digital loop, a digital output signal from said filtered signal.
Dependencies are inferred from the claim text.