Siva Sudani Degang Chen 0001 Randall L. Geiger High resolution ADC spectral test with known impure source and non-coherent sampling. 2674-2677 2013 ISCAS https://doi.org/10.1109/ISCAS.2013.6572429 conf/iscas/2013 db/conf/iscas/iscas2013.html#SudaniCG13