Tell me how you will use that and I will tell you the answer.

"Paul Burridge" wrote in message
...
What's the maximum multiplication factor it's practical and sensible
to attempt to achieve in one single stage of multiplication? (Say from
a 7Mhz square wave source with 5nS rise/fall times.)
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In article ,
Paul Burridge wrote:
What's the maximum multiplication factor it's practical and sensible
to attempt to achieve in one single stage of multiplication? (Say from
a 7Mhz square wave source with 5nS rise/fall times.)

Depends on what you call "practical".

I know that one type of atomic clock uses a one stage frequency multiplier
to go from about 10MHz to about 9.1GHz.

A slow edged square wave follows the 1/N rule to about the point where the
rise or fall time is equal to half a cycle of the harmonic frequency.
From that point up, the spectrum falls off at a rate of at least 1/n^2.
Usually it is faster than that.

If we assume that the 5nS rise time is the input to a stage, we can use a
fast transistor to effectively speed the edge up.
--
--
forging knowledge

In article ,
Paul Burridge wrote:
What's the maximum multiplication factor it's practical and sensible
to attempt to achieve in one single stage of multiplication? (Say from
a 7Mhz square wave source with 5nS rise/fall times.)

Depends on what you call "practical".

I know that one type of atomic clock uses a one stage frequency multiplier
to go from about 10MHz to about 9.1GHz.

A slow edged square wave follows the 1/N rule to about the point where the
rise or fall time is equal to half a cycle of the harmonic frequency.
From that point up, the spectrum falls off at a rate of at least 1/n^2.
Usually it is faster than that.

If we assume that the 5nS rise time is the input to a stage, we can use a
fast transistor to effectively speed the edge up.
--
--
forging knowledge