impedance matching of connecting in series two stages

Thread Starter

yef smith

Joined Aug 2, 2020
810
There are two circuits where one stage output is supposed to be the input of the other stage. Both circuits act properly where as you can see the output of the first stage is almost the same as the input of the second stage. When I combine them together I expect to see the output of the second stage. However because of impedance mismatch in the combined circuit, I don't get from the second stage the output as before. What could be done to match the too stages and getting from the second stage a signal as it was stand alone?
Thanks.

LTSPICE file is attached.

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