method and system for operating two or more integrators with different power supplies for an analog / digital delta sigma modulator

摘要

A method and system are disclosed for operating two or more integrator amplifiers with different power supplies for a modulator of an analog-to-digital ("A/D") converter. A first, upstream integrator is operated with one power supply, and the other downstream integrator(s) is/are operated with at least another power supply. The modulator has amplifiers with coefficient gains having values that are determined and set so that voltage levels for the at least another integrator are maintained within operating and output limits. An integrating coefficient gain k1 for the first integrator is set to have a sufficiently large value so that an integrating capacitor can be made small for the one integrator. Another integrating coefficient gain k2 for a second integrator is set to have a sufficiently small value so that an output voltage from the first integrator is sufficiently attenuated to a voltage value within an operating range of the second integrator.