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Altera_Forum
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19 years ago

NCO Megacore Phase Adjust

Hello I am using the Altera Megacore NCO Compiler and need to dinamically adjust the phase of the generated sine wave. The core has an input called phase_mod_i[] which is used for this purpos...
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Altera_Forum
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13 years ago

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Hello

I am using the Altera Megacore NCO Compiler and need to dinamically adjust the phase of the generated sine wave.

The core has an input called phase_mod_i[] which is used for this purpose. The problem is that I don't know the relation between the desired phase adjust (in degrees) and the number I need to input in the core.

Is it linear? As in:

Input (with 15 bits of angular precision) / Phase Difference (degrees)

000000000000000 / 0

100000000000000 / 180

111111111111111 / 360 (or 0)

Can anyone help me please?

Thank you

Thiago

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Hi, i'm a student university and i made a QPSK modulator with Altera Stratix II and i don't understand how set NCO for an phase modulation and how define the constallation mapper....

thx for support