Methods and systems for calibrating an analog filter

A device for compensating for non-idealities in a filter circuit that includes programmable filter circuitry including a first low-pass filter and a second low-pass filter both having a common desired cutoff frequency f0 corresponding to a first desired bandwidth BW0, the device comprising:

• code search circuitry that controls the first low-pass filter and the second low-pass filter;
• tone generation circuitry that injects a reference tone fR and a cutoff tone fC into both the first low-pass filter and the second low-pass filter,
• measurement circuitry that:
• (1) measures respective filter responses of the reference tone fR and the cutoff tone fC while the code search circuitry changes capacitor codes that control a cutoff frequency f0-1 of the first low-pass filter until a first capacitor code ICODE is determined that causes the first low-pass filter to match the desired cutoff frequency f0 as close as possible given an available resolution of the capacitor codes;
• and (2) measures respective filter responses of the reference tone fR and the cutoff tone fC while the code search circuitry changes capacitor codes that control a cutoff frequency f0-Q of the second low-pass filter until a second capacitor code QCODE is determined that causes the second low-pass filter to match the desired cutoff frequency f0 as close as possible given the available resolution of the capacitor codes;
• and
• calibration circuitry configured to calibrate for mismatch between the first low-pass filter and the second low-pass filter for one or more additional bandwidths greater than a first desired bandwidth BW0 of the desired cutoff frequency f0.