Digital quadrature detection in nuclear magnetic resonance spectroscopy

A digital quadrature detection technique for the acquisition of the nuclear magnetic resonance signal is proposed. It is demonstrated with experimenta l results that the suggested method is superior to the conventional quadrat ure detection (QD) technique. The superiority arises mainly from the fact t hat only one channel of analog circuit is utilized and no spectral distorti on due to unbalance between two channels used by the QD occurs. As a result , no phase cycling for canceling the distortion mentioned above is necessar y. (C) 1999 American Institute of Physics. [S0034-6748(99)04102-7].