Inphase (I) and Quadrature (Q) components of signals

Hi Dave,

Thanks. Yes, the NCO definitely generates 32 samples for each sine and cosine cycle. But the amplitude of values is between -3.25*10^4 and 3.25*10^4. I'm using the NCO function in DSP Builder (simulink) to display the values. I connected the 16 bit sine and cosine outputs to simulink Scope to display the values. I think the reason of having these big amplitudes is because these values are displayed as signed integer. To fix the issue, I used Output AlteraBlockset to specify [Number of Bits].[] = 1 for the sign bit and [].[Number of Bits] = 15 for the fraction part of the floating point number. So MSB is the sign bit and the rest of 15 bits is the fraction number. However, the output values are all negative and the cycle lenght is not correct, either. Or should I use another tool to check these values?

Thanks,

Lee