Continuous time ΔΣ ADC with dithering

Details Continuous time ΔΣ ADC with dithering Continuous time ΔΣ ADC with dithering

2005-04-19

2005-04-19

Tokar, Michael (Department: 2819)

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

C341S120000, C341S143000

Reexamination Certificate

active

06880262

ABSTRACT:
The present invention employs a mixture of digital signal processing and analog circuitry to reduce spurious noise in continuous time delta sigma analog-to-digital converters (CTΔΣADCs). Specifically, a small amount of random additive noise, also referred to as dither, is introduced into the CTΔΣADC to improve linear behavior by randomizing and de-correlating the quantization noise from the input signal without significantly degrading the SNR performance. In each of the embodiments, digital circuitry is used to generate the desired randomness, de-correlation, and spectral shape of the dither and simple analog circuit blocks are used to appropriately scale and inject the dither into the CTΔΣADC loop. In one embodiment of the invention, random noise is added to the quantizer input. In another embodiment, a relatively small amount of current is randomly added or subtracted in the feedback loop to randomize and de-correlate the quantization noise from the input signal while maintaining required signal to noise ratios.

REFERENCES:
patent: 6346898 (2002-02-01), Melanson
patent: 6639530 (2003-10-01), Jensen et al.
patent: 6744392 (2004-06-01), Melanson

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