P
payam
Guest
does a prescaler( mb509 or m54456) input should be squre wave or it
can be sine wave too?
any help?
can be sine wave too?
any help?
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M
mike
Guest
payam wrote:
My experience (but not with these chips) has been
that slew rate is what matters. At high frequencies,
there ain't much difference between sine and square
and you probably can't (easily) generate a higher slew rate
anyway.
The problem is at low frequencies where the sine wave
slew rate is too low. You spend too much time near the
threshold and you get noise, oscillations, etc.
You put a schmitt trigger in the input to fix that, but you
find that the delay thru the schmitt feedback puts
holes in your frequency response. CATCH 22.
One technique is to use a one-port
device like a tunnel diode. But I'd be shot by the group
members if I suggested that.
If you'd said a little about what frequencies and amplitudes
that interest you, I could have wasted less bandwidth.
mike
--
Bunch of stuff For Sale and Wanted at the link below.
laptops and parts Test Equipment
4in/400Wout ham linear amp.
Honda CB-125S
400cc Dirt Bike 2003 miles $550
Police Scanner, Color LCD overhead projector
Tek 2465 $800, ham radio, 30pS pulser
Tektronix Concept Books, spot welding head...
http://www.geocities.com/SiliconValley/Monitor/4710/
You should be asking the vendor this question.does a prescaler( mb509 or m54456) input should be squre wave or it
can be sine wave too?
any help?
My experience (but not with these chips) has been
that slew rate is what matters. At high frequencies,
there ain't much difference between sine and square
and you probably can't (easily) generate a higher slew rate
anyway.
The problem is at low frequencies where the sine wave
slew rate is too low. You spend too much time near the
threshold and you get noise, oscillations, etc.
You put a schmitt trigger in the input to fix that, but you
find that the delay thru the schmitt feedback puts
holes in your frequency response. CATCH 22.
One technique is to use a one-port
device like a tunnel diode. But I'd be shot by the group
members if I suggested that.
If you'd said a little about what frequencies and amplitudes
that interest you, I could have wasted less bandwidth.
mike
--
Bunch of stuff For Sale and Wanted at the link below.
laptops and parts Test Equipment
4in/400Wout ham linear amp.
Honda CB-125S
400cc Dirt Bike 2003 miles $550
Police Scanner, Color LCD overhead projector
Tek 2465 $800, ham radio, 30pS pulser
Tektronix Concept Books, spot welding head...
http://www.geocities.com/SiliconValley/Monitor/4710/
P
Phil Cline
Guest
They rate the input level in dBm. The input would be a sine wave.Also in
the data they(Fujitsu) mention cap coupling the input. I suspect that
they can divide squares as well though. Square waves are generally not
rated in dBm. RF VCOs usually put out sines as well.
payam wrote:
the data they(Fujitsu) mention cap coupling the input. I suspect that
they can divide squares as well though. Square waves are generally not
rated in dBm. RF VCOs usually put out sines as well.
payam wrote:
does a prescaler( mb509 or m54456) input should be squre wave or it
can be sine wave too?
any help?