sine and cosine wave generation

[FPGA]

Can anyone give guidelines on how to generate sine and cosine wave in
VHDL?

 

[Jon Beniston]

Can anyone give guidelines on how to generate sine and cosine wave in
VHDL?

Use a look-up table.

Cheers,
Jon

 

[Ralf Hildebrandt]

Can anyone give guidelines on how to generate sine and cosine wave in
VHDL?

A very common technique is a look-up table.

Ralf

 

[FPGA]

A very common technique is a look-up table.

Ralf

Could you please explain in more detail

 

[Kris Vorwerk]

Could you please explain in more detail

http://www.actel.com/documents/Fusion_Waveform_TB.pdf

K.

 

[comp.arch.fpga]

Can anyone give guidelines on how to generate sine and cosine wave in
VHDL?

You can build a numerical oscillator:

Initialization:
sin[0] = 1;
cos[0] = 0;

Iteration:
sin[t] = sin[t-1]-cos[t-1]*k;
cos[t] = cos[t-1]+sin[t-1]*k;

The Frequency depends on k. If k is 1/2**k you do not even net a
multiplier.

This only works for a continues sequence of values. If you need values
in random
order you must use a lookup table or CORDIC. Both are available as
cores in ISE.

Kolja Sulimma
cronologic ohg

 

[Symon]

Can anyone give guidelines on how to generate sine and cosine wave in
VHDL?

library IEEE;
use IEEE.MATH_REAL.all;
signal x,y : real;begin x <= sin(y);end;HTH., Syms.

 

[Arlet Ottens]

Can anyone give guidelines on how to generate sine and cosine wave in
VHDL?

You can build a numerical oscillator:

Initialization:
sin[0] = 1;
cos[0] = 0;

Iteration:
sin[t] = sin[t-1]-cos[t-1]*k;
cos[t] = cos[t-1]+sin[t-1]*k;

The Frequency depends on k. If k is 1/2**k you do not even net a
multiplier.

This only works for a continues sequence of values. If you need values
in random
order you must use a lookup table or CORDIC. Both are available as
cores in ISE.

Kolja Sulimma
cronologic ohg

If you slightly modify the iteration, like this:

sin[t] = sin[t-1] - cos[t-1] * k;
cos[t] = cos[t-1] + sin[t] * k;

then the solution doesn't suffer from accumulating rounding errors, at
the cost of some distortion.

 

[FPGA]

You can build a numerical oscillator:

Initialization:
sin[0] = 1;
cos[0] = 0;

Iteration:
sin[t] = sin[t-1]-cos[t-1]*k;
cos[t] = cos[t-1]+sin[t-1]*k;

The Frequency depends on k. If k is 1/2**k you do not even net a
multiplier.

This only works for a continues sequence of values. If you need values
in random
order you must use a lookup table or CORDIC. Both are available as
cores in ISE.

Kolja Sulimma
cronologic ohg

If you slightly modify the iteration, like this:

sin[t] = sin[t-1] - cos[t-1] * k;
cos[t] = cos[t-1] + sin[t] * k;

then the solution doesn't suffer from accumulating rounding errors, at
the cost of some distortion.- Hide quoted text -

- Show quoted text -

Thanks all for your help.