Patent ID: 8451051
Filing Date: 2013-05-28
Classification: H03M,H04B

Abstract:
1. A dual mode sigma-delta analog-to-digital converter (ADC) comprising: a first switched-capacitor integrator, for integrating a sum of an input signal and a first feedback signal; a second switched-capacitor integrator, coupled to the first switched-capacitor integrator for integrating a sum of an output of the first switched-capacitor integrator and a second feedback signal; a quantizer, having an input terminal coupled to the second switched-capacitor integrator, and an output terminal for providing an output signal of the ADC in at least first and second logic states in response to an output of the second switched-capacitor integrator; a feedback circuit, coupled to the first switched-capacitor integrator and the second switched-capacitor integrator for providing the first feedback signal to the first switched-capacitor integrator and the second feedback signal to the second switched-capacitor integrator; and a mode device, coupled to an input terminal of the first switched-capacitor integrator and an output terminal of the second switched-capacitor integrator for providing a mode signal to control an operation of the first switched-capacitor integrator and an operation of the second switched-capacitor integrator.