Analog signal conditioning

A method in an analog conditioning circuit comprising an anti-aliasing filter for conditioning an analog input signal to provide a conditioned analog signal for input into an analog processing circuit;

• the method comprising:
• filtering a first signal derived from the analog input signal to attenuate desired frequencies of the first signal to provide a filtered analog signal;
• and
• subtracting the filtered analog signal from a second signal derived from the analog input signal to provide the conditioned analog signal;
• wherein a transfer function between the analog input signal and the conditioned analog signal is constrained by a transfer function requirement associated with the analog processing circuit.

An integrated circuit comprising:

• an analog conditioning circuit comprising an anti-aliasing filter, wherein the analog conditioning circuit is configured to process an analog input signal to provide a conditioned analog signal for input into an analog processing circuit, wherein the analog conditioning circuit comprises:
• a main signal path between an input for receiving the analog input signal and an output for outputting the conditioned analog signal, wherein the a transfer function of the main signal path is constrained by a transfer function requirement associated with the analog processing circuit;
• and
• a feedforward signal path comprising a first filtering block configured to attenuate desired frequencies of a first signal derived from the analog input signal to provide a filtered analog signal;
• wherein the feedforward signal path is configured to input the filtered analog signal into the main signal path such that the filtered analog signal is subtracted from a second signal derived from the analog input signal to provide the conditioned analog signal;
• and
• an analog processing circuit configured to receive the conditioned analog signal.