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The filter in the schematic is not inside the chip. You have to add all the discrete components around the chip, as shown in your schematic.8cube said:what do you mean by a filter and a half? the filter in the schematic is inside the chip ... the output of the chip will connect to a low pass filter.. that is , the double pi low pass filter...
The filter is already designed for you - L3, L4, C11, C12, and C13. Why do you think you need another filter?8cube said:this is also a double pi filter? how to choose a low pass filter? wat is the calculation? really blur now
8cube said:after the signal come out from modulator, need to pass through a low pass filter to remove the distortion , is it correct?
Amen.David Bridgen said:8cube said:after the signal come out from modulator, need to pass through a low pass filter to remove the distortion , is it correct?
The i.c. MC1374 is the modulator.
The signal comes out of pin 9.
The components which I highlighted in my 2nd post (L3, L4, C11, C12, and C13), and mentioned again by Ron H in his last post, form the low-pass filter which you are so anxious to locate yet so reluctant to accept.
It attenuates the harmonics and other high-order modulation products.