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Designing with a NCO
Engineers seeking to design with an NCO can actually calculate the performance limit for a given set of parameters. As previously indicated a phase accumulator of P bits is converted to a stepped sinusoid by a mapping a single cycle of a sine wave into a mapping ROM (Read Only Memory) with the most significant A bits of the phase. The D bits of output are then converted to a voltage using a DAC (Digital Analog Converter).

The performance of this NCO parameterized by P, A, and D bits is: