LT1167 in LTSpice


I tried to build EMG sensor based on LT1167. I found typical application (figure 8) and try simulate it in LTSPICE.

AC Analysis looks ok but something weird happen in trans.

After first filter (Highpass - red wave) it looks ok but after second filter it gives me square wave. Why this is happened? Is suppose to just gain in this frequency. Maybe I don't understand what going on in circuit.

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    •  Analog Employees 
    on May 29, 2019 5:11 PM over 1 year ago in reply to Kil307

    Looks like reducing the input signal amplitude allows you to resolve the square wave at output problem.

    In the real circuit you'll also run into voltage swing limitations if you exceed the part's voltage swing / power supply limitation and often times yes, it does resemble a square wave.