Dual mode digital filters for rf sampling transceivers

A dual mode interpolation filter having a lower parallelization mode and a higher parallelization mode, the dual mode interpolation filter comprising:

• a first reconfigurable filter and a second reconfigurable filter, each reconfigurable filter comprising:
• a plurality of filter stages, each filter stage comprising:
• a multiplexer configured to select either an input sample provided by a filter stage immediately preceding the filter stage or an input sample provided by a filter stage immediately preceding the immediately preceding filter stage;
• and
• one or more multipliers that each filter the input signal selected by the multiplexer;
• and
• adders coupled to the multipliers configured to generate output samples by summing the outputs of the multipliers.

A transceiver, comprising:

• one or more dual mode filters, each dual mode filter comprising a first reconfigurable filter and a second reconfigurable filter, each reconfigurable filter comprising a plurality of filter stages, each filter stage comprising:
• a multiplexer configured to select either a partial sum generated by a filter stage immediately preceding the filter stage or a partial sum generated by a filter stage immediately preceding the immediately preceding filter stage;
• one or more multipliers, each coupled to an input signal and one of a plurality of unique filter coefficients and having an output operable to output a filtered input signal;
• and
• an adder coupled to at least one multiplier and operable to generate a partial sum for the filter stage by adding the one or more filtered input signals and the partial sum selected by the multiplexer.