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Old February 24th 04, 11:04 PM
SWbeginner
 
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How high can the 74HC4066 as mixer go?
I need 50Mhz tops.

I still like to know how strong dual gate MOSFET is compared to say diode
ring.

thx
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Old February 25th 04, 08:45 PM
John Jardine
 
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SWbeginner wrote in message
...
How high can the 74HC4066 as mixer go?
I need 50Mhz tops.

I still like to know how strong dual gate MOSFET is compared to say diode
ring.

thx


?

The HC4066 is OK(ish) to about 10megs.
A dual gate fet (eg 40673) -with care- should be able give out roughly the
same, or a little more voltage than what is coming in. With a diode ring
expect to pick up (say) only 40mV of an incoming 100mV.
[Easiest / most reliable]: use a "Bus Switch" such as the FST3125, toggled
by 74AC type logic; handle the A.C. signals by couple of video op-amps).
('Output' signal looks like what you see in a text book).
regards
john


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Old February 25th 04, 08:45 PM
John Jardine
 
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SWbeginner wrote in message
...
How high can the 74HC4066 as mixer go?
I need 50Mhz tops.

I still like to know how strong dual gate MOSFET is compared to say diode
ring.

thx


?

The HC4066 is OK(ish) to about 10megs.
A dual gate fet (eg 40673) -with care- should be able give out roughly the
same, or a little more voltage than what is coming in. With a diode ring
expect to pick up (say) only 40mV of an incoming 100mV.
[Easiest / most reliable]: use a "Bus Switch" such as the FST3125, toggled
by 74AC type logic; handle the A.C. signals by couple of video op-amps).
('Output' signal looks like what you see in a text book).
regards
john


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