DC dither circuitry and method for delta-sigma modulator
A characteristic tone in a delta-sigma analog-to-digital converter is shifted out of an audible pass band without diminishing dynamic range or signal-to-noise ratio thereof by operating the digital-to-analog converter to measure its offset voltage. If the amplitude of the measured offset voltage exc...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | A characteristic tone in a delta-sigma analog-to-digital converter is shifted out of an audible pass band without diminishing dynamic range or signal-to-noise ratio thereof by operating the digital-to-analog converter to measure its offset voltage. If the amplitude of the measured offset voltage exceeds a predetermined value, no dither signal is applied to the input of the delta-sigma modulator. If the measured offset voltage is less than the predetermined value, a positive DC dither voltage is added to the input voltage of the delta-sigma modulator if the measured offset voltage is positive, or is subtracted if the measured offset voltage is negative. |
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