Delta-sigma modulators with improved noise performance

Details Delta-sigma modulators with improved noise performance Delta-sigma modulators with improved noise performance

2005-10-18

2005-10-18

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S150000

Reexamination Certificate

active

06956514

ABSTRACT:
An integrator stage for use in a delta sigma modulator includes an operational amplifier, an integration capacitor coupling an output of the operational amplifier and a summing node at an input of the operational amplifier, and a feedback path. The feedback path includes first and second capacitors having first plates coupled electrically in common at a common plate node and switching circuitry for sampling selected reference voltages onto second plates of the capacitors during a sampling phase. The integrator stage further includes a switch for selectively coupling the common plate node and the summing node during an integration phase.

REFERENCES:
patent: 5079550 (1992-01-01), Sooch et al.
patent: 5790064 (1998-08-01), Fujimori
patent: 6252531 (2001-06-01), Gordon et al.
patent: 6674386 (2004-01-01), Carreau et al.

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