Patent ID: 8665126
Filing Date: 2014-03-04
Classification: G01R,G06J,H03M

Abstract:
1. An apparatus including a sigma-delta difference-of-squares RMS-to-DC converter, comprising: analog signal multiplication and combining circuitry responsive to an analog input signal and an analog feedback signal by providing a resultant analog signal including at least one signal component corresponding to a difference between a square of said analog input signal and said analog feedback signal; analog signal filter circuitry coupled to said analog signal multiplication and combining circuitry, and responsive to said resultant analog signal by providing a filtered analog signal; analog-to-digital conversion (ADC) circuitry coupled to said analog signal filter circuitry and responsive to said filtered analog signal by providing a related digital output signal; and feedback signal conversion circuitry coupled between said ADC circuitry and said analog signal multiplication and combining circuitry, and responsive to said digital output signal by providing said analog feedback signal, wherein said analog feedback signal is related to said digital output signal in accordance with at least one defined non-linear function.