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Increasing the frequency resolution of NCO-systems using a circuit based on a digital adder

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2 Author(s)
Ertl, R. ; Dept. of Electr. Eng., Tech. Univ. Wien, Austria ; Baier, J.

A digital low cost solution for increasing the frequency resolution of Direct Digital Synthesizers (DDS) containing Numerically Controlled Oscillators (NCO's) is presented. The additional hardware can be used for all off-the-shelf NCO's offering a carry input of the internal phase-accumulator. Its simplicity makes it suitable for many applications, especially where cost-efficient solutions are required. An example of an actual implementation of a signal-generator using this technique is presented and described

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:43 ,  Issue: 3 )