I am making a transmit video signal circuit. I need an IC to amplify and filter the video signal. Can you show me ic how best to do this job. Thank you ^^

 

What type of video signal and over what medium do you want to transfer it?

 

What type of video signal and over what medium do you want to transfer it?

I want to transmit composite video signal (NTSC) which uses 3.58MHz sub-carrier frequency. The signal after amplification is taken into pulse width modulation. Can you tell me what the best IC for this work? Thank you^^

 

What frequency would the pulses be. I expect the PWM would need to be 20 mhz or more.
40 mhz would be better.

 

Frequency of pulses is 15MHz. What IC I should use?

 

I cannot see how you are going to succeed in transmitting a 40MHz video signal with a 15MHz PWM signal.

 

I cannot see how you are going to succeed in transmitting a 40MHz video signal with a 15MHz PWM signal.

No, I want to transmit composite video signal (NTSC). The linear ramp carrier signal at a frequency of 15 MHz

It here http://forum.allaboutcircuits.com/attachment.php?attachmentid=70600&stc=1&d=1404996227. I get it on the Internet but it doesn't have hardware information. Can you help me? Addition, can you tell me how does filter work? Thank you^^

 

I can't help you because I don't think it will work.

 

You can firs try this without the filter or the amplifier, and if you test with a test pattern that does not change with time, you can connect the video to a DC restore (AKA clamp) circuit to the comparator. You will need a pretty fast sawtooth; I suggest 4x subcarrier otherwise you will get terrible beats between the sampling sawtooth and the subcarrier. Use a fast comparitor like the LM710.

Later you can add a 4.5 MHz low-pass filter to the input.

The circuit below includes an clamp and an 3.5 x amplifier. Adjust R29 to change the gain.

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It can work. I read on this journey http://jwcn.eurasipjournals.com/content/2013/1/250. However, it does't mention hardware. I want to find what devices to make this circuit, so I need help.

 

It does mention some ics for video and audio, TVL3502 op amp, Si1563 mosfet, AK5386 ADC,

its using optical transmission of video and audio using a pwm carrier of 15Mhz at a distance of 50 to 100 cm.

 

It does mention some ics for video and audio, TVL3502 op amp, Si1563 mosfet, AK5386 ADC,

its using optical transmission of video and audio using a pwm carrier of 15Mhz at a distance of 50 to 100 cm.

TVL3502 is used as a comparator. AK5386 is a ADC. I need a IC for amplifier and filter video signal. This isn't mentioned in journey.

 

well have a search for Ntsc video amps, check out this from LT

 

Another video amp with filtering you may try OPA360.
Part and data sheet is at Mouser.com

 

Thank you everyone's help^^