Sigma delta converter insensitive to asymmetrical switching time

Details Sigma delta converter insensitive to asymmetrical switching time Sigma delta converter insensitive to asymmetrical switching time

1991-11-25

1993-03-23

Hoff, Marc

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341172, H03M 302

Patent

active

051968533

ABSTRACT:
Sigma-delta converter for converting an analog input signal into a sigma-delta code. The converter includes a threshold device (222) for generating an output and feedback signal, a filter receiving said analog input signal and said feedback signal from at least one feedback loop. The sigma-delta converter further includes circuits (221, 222) located in said feedback loop for performing a return-to-zero of the sigma-delta code generated by said threshold device at every period of the sigma delta clock, whereby said sigma-delta converter is insensitive to the asymmetry of the rise and fall time of the threshold device. This results in an increase of the signal-to-noise ratio and linearity of the converter, allowing the manufacture of a sigma-delta convertor with discrete components without requiring the development of an integrated circuit using switched capacitor technology.

REFERENCES:
patent: 3956700 (1976-05-01), Condon
patent: 4588981 (1986-05-01), Senn
patent: 5027120 (1991-06-01), Thurston
patent: 5061928 (1991-10-01), Karema et al.
patent: 5073777 (1991-12-01), Fukuhara et al.
IBM Technical Disclosure Bulletin, vol. 32, No. 6A, Nov. 1989, New York, pp. 391-392, "Delta-Sigma Converter Having Linear Conversion Transfer Function Independent of Signal Edge Transition Asymmetry of the Coder".

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