Newbie level 6
I want to ask if anyone of you know how to design a frequency multiplier analog circuit.The frequency is 0.1MHz to 25MHz & I want to convert it to 0.4MHz to 100MHz.If anyone can help me i will become grateful.
A PLL like TLC2934 has a sufficient VCO frequency range, but not the specified lock range. Generally, the dynamic PLL behaviour for wide frequency range is rather poor due to the bad matched loop filter.A PLL like a 4046 would do the job, except the 4046 doesn't go quite that high in frequency.
You're right of course. An ideal squarer gives only the double frequency and a DC component for a sin input.It depends on how pure you need the output. If you don't overdrive a Gilbert mixer you can get a decent output.
There is no wide band way of doing this, however using variable tuning its relatively easy. One very complex way of making the circuit appear wide band would be to make it auto tuning.
What is your input signal - level, rate of change of frequency etc. Why are you considering trying to do this?