Digital EPR with an arbitrary waveform generator and direct detection at the carrier frequency

► An arbitrary waveform generator, digitizer, and computer constitute a 'digital' EPR bridge. ► Digital down-conversion at the carrier frequency produces baseband signals in perfect quadrature. ► The background leakage signal through a cross-loop resonator can be attenuated by a compensation signal generated by an AWG. ► The size of the data set for spin echo decay can be decreased by echo summation in the digitizer.