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How to build a analog flip flop

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EDA_hg81

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I have a 50MHZ analog clock signal from -2V to +3V.

I want to use analog flip flop to generate 25MHZ 50% duty cycle clock.

How I can do it?

Thanks.
 

jpanhalt

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Any divide by 2 circuit will work, like this one: LM555 Timer Circuits

If you are committed to using a transistor flip-flop for experience or teaching, let us know. There are simple circuits for that.

john
 

EDA_hg81

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Please let me know the transistor flip-flop.

I want to find a good quality analog flip flop.

Thank you so much.
 

jpanhalt

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Please let me know the transistor flip-flop.
That I can do, or just search on transistor flip flop. Here are just two of many sources:

http://en.wikipedia.org/wiki/Flip-flop_(electronics)
Transistor RS Flip Flop Tutorial & Circuits - Flip Flop Tutorials - Electronic Hobby Projects

I want to find a good quality analog flip flop.
I am not quite sure what you mean by an "analog flip-flop." If you notice in my earlier reply, I somehow assumed you meant a transistor flip-flop.

John
 

FvM

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That I can do, or just search on transistor flip flop. Here are just two of many sources
Unfortunately, the shown transistor flip-flops aren't suited as frequency divider, requiring a D- or T-FF rather than the shown simple RS-FFs.
 

alexan_e

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jpanhalt

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@FvM
You got me there. Long day at the farm -- really. Here is a "slightly" more complicated edge triggered, transistor flip-flop (it's about half way down): Flip-Flop

@alexan_e: I didn't mean the 555 part. I meant the frequency divider part with a flip-flop. The SN7474 shown would not make the 50 MHz part, though.

I got up at 0400 local, and post #2 was the last thing I did as I rushed out the door. Next time, I will be sure to be awake. Thanks for pointing out my oversights. I'm going to have a Scotch and go to bed. Early day tomorrow, too.

John
 

FvM

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Here is a "slightly" more complicated edge triggered, transistor flip-flop.
I also a remember a two-transistor toggle FF with a CD circuit that provided alternate switching. I doubt that it would work well with a 50 MHz clock, I fear the same with the complicated one. Consider that even a classical TTL FF doesn't work at 50 MHz.
 

alexan_e

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I'm not sure of the specification
I have a 50MHZ analog clock signal from -2V to +3V.
I want to use analog flip flop to generate 25MHZ 50% duty cycle clock.
I'm not sure about the voltage specification of the divided clock, he mentions -2 to +3v as the original clock that he wants to divide but what should be the range of the divided clock?

Alex
 

EDA_hg81

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the divided clock should be -2V to +3V too.

Thank you all for your help.
 

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