Oversampled A/D converter using filtered, cascaded noise shaping

Details Oversampled A/D converter using filtered, cascaded noise shaping Oversampled A/D converter using filtered, cascaded noise shaping

1988-03-25

1989-08-29

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375 33, H03M 302

Patent

active

048621692

ABSTRACT:
An oversampling A/D converter for high resolution data conversion is provided. An analog input signal is quantized into a digital equivalent value with a finite quantization error associated therewith in a first circuit portion. An analog low pass filter is inserted between the first circuit portion and a second circuit portion similar in function and circuitry to the first circuit portion. The second circuit portion functions to remove the error of the first circuit portion from an output signal by providing a signal component, which when added with the output of the first circuit portion cancels the error of the first circuit portion. The low pass filter provides attenuation of quantization error provided by the second circuit portion which results in an output signal with a significantly attenuated error.

REFERENCES:
patent: 2927962 (1960-03-01), Cutler
patent: 4107669 (1978-08-01), Tewksbury
patent: 4468790 (1984-08-01), Hofelt
patent: 4704600 (1987-11-01), Uchimura et al.

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