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Sine/Cosine wave oscillator IC

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naumank

Member
Hi all

I am trying to implement a quadrature demodulator circuit using multiplier ICs, sine/cosine wave oscillators, low pass filters etc. Currently, i am stuck with sine/cosine wave oscillator (or quadrature oscillator) as i am unable to find a suitable IC which can generate pure sine/cosine wave forms from 90 KHz to 500 KHz frequency. Mostly i found Op-amps based circuits used in oscillation mode.

Can any one kindly point me some ICs which can generate sine/cosine wave forms in frequency range of 90 KHz to 500 KHz plz?

Thanks
 

crutschow

Well-Known Member
Most Helpful Member
Perhaps a quadrature oscillator will work for you.
Otherwise you may have to go to a digital frequency synthesizer to get quadrature signals over such a wide frequency range.
 

naumank

Member
Perhaps a quadrature oscillator will work for you.
Otherwise you may have to go to a digital frequency synthesizer to get quadrature signals over such a wide frequency range.
Hi crutschow

Thanks for help. Mostly the quadrature oscillators available are of audio frequency range. By digital frequency synthesizer do you mean Direct Digital Synthesizer (DDS) IC?
 

JimB

Super Moderator
Most Helpful Member
A direct digital synthesiser (DDS) such as an AD9850 can be used to generate those frequencies very easily.

To generate the sine and cosine signals, you will need two AD9850, driven from a common clock frequency. Send the tuning word to each chip with the same frequency information, but the second chip should be sent phase information for the 90 degree shift.

JimB
 

naumank

Member
A direct digital synthesiser (DDS) such as an AD9850 can be used to generate those frequencies very easily.

To generate the sine and cosine signals, you will need two AD9850, driven from a common clock frequency. Send the tuning word to each chip with the same frequency information, but the second chip should be sent phase information for the 90 degree shift.

JimB
Hi JimB

Thanks for help.
 
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