OVERSAMPLING FOLLOWED BY DIGITAL FILTERING AND DECIMATION IMPROVES SNR AND ENOB fs ADC DECIMATOR QUANTIZATION NOISI REMOVED BY DIGITAL FILTER Figure 3.7 Since the bandwidth is reduced by the digital output filter, the output data rate may be lower than the original sampling rate and still satisfy the Nyquist criterion. This may be achieved by passing every Mth result to the output and discarding the remainder. The process is known as"decimation"by a factor of M. Despite the origins of the term(decem is Latin for ten), M can have any integer value, provided that the output data rate is more than twice the signal bandwidth. Decimation does not cause any loss of information(see Figure 3.8) DECIMATION AFTER SAMPLING AT fs AND FILTERING, THE OUTPUT DATA RATE MAY BE REDUCED TO f/M WITHOUT LOSS OF INFORMATION FILTER PASSBAND 2 Figure 3.87 OVERSAMPLING FOLLOWED BY DIGITAL FILTERING AND DECIMATION IMPROVES SNR AND ENOB Figure 3.7 Since the bandwidth is reduced by the digital output filter, the output data rate may be lower than the original sampling rate and still satisfy the Nyquist criterion. This may be achieved by passing every Mth result to the output and discarding the remainder. The process is known as "decimation" by a factor of M. Despite the origins of the term (decem is Latin for ten), M can have any integer value, provided that the output data rate is more than twice the signal bandwidth. Decimation does not cause any loss of information (see Figure 3.8). DECIMATION Figure 3.8