Programmable baseband filter for selecting between single-pole or complex-poles frequency response

A method, comprising:

• operating a set of one or more switching devices to configure a filter with a first set of one or more poles;
• filtering a first input signal to generate a first output signal with the filter configured with the first set of one or more poles;
• operating the set of one or more switching devices to configure the filter with a second set of poles, wherein a number of poles in the first set of one or more poles is different than a number of poles in the second set of poles;
• and
• filtering a second input signal to generate a second output signal with the filter configured with the second set of poles,
• wherein the filter configured with the second set of poles includes a capacitor coupled between differential inputs of the filter.

A filter, comprising:

• a first amplifier having differential inputs and differential outputs;
• first and second feedback resistors respectively coupled to the differential outputs;
• a capacitor;
• a first plurality of switching devices configured to selectively couple the first feedback resistor to a first input of the differential inputs or a first terminal of the capacitor;
• and
• a second plurality of switching devices configured to selectively couple the second feedback resistor to a second input of the differential inputs or a second terminal of the capacitor.