Digital correction techniques for wideband receiver signal chain nonlinearities

A receiver signal chain with digital nonlinearity correction, comprising:

• one or more nonlinear components to process a received analog signal;
• an analog-to-digital converter (ADC) to digitize the processed received analog signal;
• and
• a first branch comprising:
• a first linear filter to receive a digital output signal of the ADC;
• a first function to receive an output of the first linear filter;
• a second linear filter to receive an output of the first function;
• a second function to receive the output of the first linear filter;
• a third linear filter to receive an output of the second function;
• a combination network to receive and combine at least outputs of the second linear filter and the third linear filter to provide a combined output;
• and
• a fourth linear filter to receive the combined output from the combination network and generate a first nonlinearity at the output of the fourth linear filter.

A method for digital nonlinearity correction suitable for a receiver signal chain, comprising:

• applying a first linear filter to a digital output signal downstream of an analog-to-digital converter (ADC);
• in a first path:
• applying a first function to an output of the first linear filter;
• and
• applying a second linear filter to an output of the first function;
• in a second path:
• applying a second function to the output of the first linear filter;
• and
• applying a third linear filter to an output of the second function;
• combining at least outputs of the first path and the second path to provide a combined output;
• applying a fourth linear filter to the combined output;
• generating a first nonlinearity at the output of the fourth linear filter;
• and
• combining the first nonlinearity with a second nonlinearity generated by further paths parallel to the first linear filter.