Hi.
I need an IC for multiplying tow voltage(sinosuidal and pulse)with frequencies around 3KHz.
If anyone help me with this matter,I will be very grateful of him/her.

 

Could you use this chip, or some variant of it ? http://www.onsemi.com/pub_link/Collateral/MC1496-D.PDF Quite common and cheap.

 

I think this is more what he is looking for.

 

I think this is more what he is looking for.

Maybe but to me it looked at first glance that the OP wanted to do a modulation task. Anyway this is a search the OP can do https://www.google.com/search?q=multipler+used+as+modulator

 

Are you gating the sinusoid with a digital pulse or are you modulating the digital wave with a sine envelope?

You might consider using an analog gate such as a CD4066.

 

thank all of you,due to spending time for answering me.my perpose is generating a waveform(special one,not only a sine one,there must be some changes in the original waveform that I know how to do,but I wanted to remove some part of it by a periodic pulse).