Continuous time delta sigma ADC with dithering

Details Continuous time delta sigma ADC with dithering Continuous time delta sigma ADC with dithering

2007-02-13

2007-02-13

Nguyen, Linh Van (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C341S120000, C341S118000, C341S143000, C341S155000

Reexamination Certificate

active

11069365

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: 5144308 (1992-09-01), Norsworthy
patent: 5889482 (1999-03-01), Zarubinsky et al.
patent: 6084538 (2000-07-01), Kostelnik et al.
patent: 6172629 (2001-01-01), Fetterman
patent: 6346898 (2002-02-01), Melanson
patent: 6351229 (2002-02-01), Wang
patent: 6462685 (2002-10-01), Korkala
patent: 6515601 (2003-02-01), Fukuhara et al.
patent: 6639530 (2003-10-01), Jensen et al.
patent: 6738002 (2004-05-01), Ercan et al.
patent: 6744392 (2004-06-01), Melanson
patent: 6880262 (2005-04-01), Jensen

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