Sine wave generator

[Mario]

Can I use the Pic to generate me 10 MHz pure sine wave.IF it is possible can someone help me with the code.

[Darrel Taylor]

Yes, but only if you use a 16F84 @ 4Mhz

Well, actually, No.

If you had an 18F running at 40mhz, you could execute 1 instruction per cycle of that 10mhz. That's not enough to add 2 numbers, let alone generate a sine wave.

Now, if you really meant 10khz, then Yes, you can get close with FREQOUT. But it won't be "Pure".

.

[mister_e]

Is the frequency of 10MHZ may change or you want it fix?

1. Some Wein bridge Op-Amp circuit are possible.. at 10MHZ.. may work or not, never tried it before.
   
2. MAX038 will work... not cheap, do too much things
   
3. 10MHZ square wave TTL or CMOS based and integrated twice (or more) with low pass/bandpass/highpass filter using op-amp.
   
4. If your project will use a PIC.. why not choosing a 10MHZ Crystal and send the sgnal to a buffer... then send it to those low-pass filter?

[Mario]

Is the frequency of 10MHZ may change or you want it fix?

1. Some Wein bridge Op-Amp circuit are possible.. at 10MHZ.. may work or not, never tried it before.
   
2. MAX038 will work... not cheap, do too much things
   
3. 10MHZ square wave TTL or CMOS based and integrated twice (or more) with low pass/bandpass/highpass filter using op-amp.
   
4. If your project will use a PIC.. why not choosing a 10MHZ Crystal and send the sgnal to a buffer... then send it to those low-pass filter?

Actually why I 'm thinking in that way, because I'm restricted with 9 v battery so you can't use opamp and it's is not simple to design it using transistors (I'm not good in that).

As MR. Darrel Taylor said it's not possible with PIC , then help me with any circuits.

[Luciano]

Hi Mario,

Search DDS (Direct Digital Synthesis).
Search with Google: DDS 16f84

Examples with an AVR:
http://www.myplace.nu/avr/minidds/
http://www.geocities.com/leon_heller/minidds.html

Best regards,

Luciano

[Mario]

Hi Mario,

Search DDS (Direct Digital Synthesis).
Search with Google: DDS 16f84

Examples with an AVR:
http://www.myplace.nu/avr/minidds/
http://www.geocities.com/leon_heller/minidds.html

Best regards,

Luciano

thank you for ur co-operation but that will not work with me. My project should be portable (not connected PC).what I want exactly is simple (sinewave) oscillator circuit with a single supply (not more than 9v) at 10 MHz or more.