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problem about bootstrap switch

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Lantis

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bootstrap switch

I got some problem about bootstrap switch (as shown in the bootstrap.jpg).

Vin is connected to a source voltage with input impedance about 50ohm, and input common voltage is 1.5V.

When I connect it with bootstrap switch, Vin common voltage becomes 0.4V but I did not know the reason why. Does it necessary to use input buffer when I use bootstrap switch?


Help me Plz.

(ps:The clk is 90MHz clock. )[/img]
 

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