Quadrature Oscillator frecuency

[ea7fnj]

Hi guys.

I would like to make a Quadrature Oscillator in a DSP. I have seen those functions:

- sin (a + b) = sin(a) cos(b) + cos(a) sin(b)
- cos(a + b) = cos(a) cos(b) - sin(a) sin(b)

where a = [(2·pi·F)/Fs]n and b = [(2·pi·F)/Fs].

The questions are:

- What is the max frecuency that I can get with it?
- The angle degree between 0-90 or 0-360?

Thanks

 

[brmadhukar]

Hi,
How do you use these functions. Will you keep b to be some Δt and keep updating a. I find not problem. The phase depends on your reference.

brmadhukar