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Help me in frquency multiplication

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coolstuff07

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Hi,

I want to design a circuit. whose input is 1Mhz square wave and output should be 2Mhz to 5Mhz. I dont want to use PLL.

Please help me.

Bye.
 

Hi,

Any one please help me.

Bye
 

The question is very unclear. If you don't want to use a PLL (why?), what are the specifications for your clock? What type of circuit would be accepted at all? It can't have exact timing (cause this would require a PLL). What phase relation between input and output is required. What do you mean with 2Mhz to 5Mhz. So a free running oscillator between 2 and 5 MHz would be O.K.? The output wouldn't be related to the input, but that isn't requested, exactly.
 

I agree with FvM here, if the output required is not to be a set integer multiple of the input frequency, then why create it from the 1 MHz i/p?

But you could use a delay line and an exor to detect edges and double the frequency, and then use a monostable to set the duty cycle of the clock. This'll give you a 2Mz clock, you can repeat the process and get a 4Mz clock.
Assuming you can find a monostable to make pulses that narrow, (I've only used these a few times, and the pulses I made were between 1us and 5us).
 

As most simple solution, an exor gate with RC or LRC low pass at one input can be used as frequency doubler, but with a poor defined duty cycle.
 

A balanced modulator or multiplier can be used to double the frequency. Another way is generate a lot of harmonics, and use resonant circuit (or filter) to obtain desired frequency which is integer multiple of the input.
S. H.
 

Hi,

I want to design a frquency multiplier. Input is 1MHz and should be 2MHz, 3MHz, 4MHz. Based upon some kind of tunning.

Bye

Added after 2 minutes:

Hi,

I want to design a frquency multiplier. Input is 1MHz and output should be 2MHz, 3MHz, 4MHz. Based upon some kind of tunning.

If any circuit please help me.

Bye
 

coolstuff07 said:
Hi,

I want to design a circuit. whose input is 1Mhz square wave and output should be 2Mhz to 5Mhz. I dont want to use PLL.

Please help me.

Bye.
Click to expand...

you can use frequency doubler
 

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