Patent ID: 6954160

Claim:
A system for filtering an analog input signal using a digital filter and analog feedback comprising: a signal combiner for producing an analog output signal based upon an analog input signal and one or more analog feedback signals, the signal combiner having at least one input for receiving an analog input signal and the one or more analog feedback signals, and an output for outputting the analog output signal; an analog-to-digital converter for converting the analog output signal into a digital data stream, the converter being communicatively coupled to receive the analog output signal from the signal combiner; a digital signal processing unit for filtering the digital data stream being communicatively coupled to receive the digital data stream from the converter and to send at least one digital output signal to an analog feedback module for producing the one or more analog feedback signals based on the at least one digital output signal; the analog feedback module being communicatively coupled to send the one or more analog feedback signals to the at least one input of the signal combiner; and a transfer function unit for receiving the digital data stream and applying a filter function, the transfer function unit further comprising: a first integrator communicatively coupled to receive the digital data stream from the converter for generating a first digital output signal; and a second integrator communicatively coupled to receive the first digital output signal from the first integrator wherein the second integrator generates a second digital output signal.