aaron_do
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Hi Jacki,
looks like M1 and M3 are diodes. When the signal goes high, the current Iin is burnt in M1, and when the signal goes low, the current is sent to the output. The differential operation makes it a full-wave rectifier, and the RC cleans it up.
If you want to know what's wrong with your simulation I suggest you post some results. Since this circuit only works on a large-signal principle, make sure Iin is large enough to turn ON/OFF the transistors M1/M3. I suggest you simulate the circuit with a PSS analysis and sweep the magnitude of Iin. To see the gain, plot the DC component of the output.
regards, Aaron
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