The input of the operational amplifier has no DC path. Can the simulation pass?

[MHMT+]

The second order Butterworth high pass filter circuit has no DC path, why can the simulation pass? The input end of the operational amplifier of the following circuit has no DC path.There is no static operating point. Can the operational amplifier work without a DC path at the input end?

[tipa]

И Вам-привет!
а где "ms"-файл!?
Для мультисимщиков это эталон вежливости, -общаться на языке программы...

[GGoodwin]

Hi MHMT+,

The portion of the circuit that you've put in a box is the low-pass, not the high-pass, filter. Anyway, both operational amplifiers have complete path to ground.

For the high-pass filter (op amp on the left) a DC path is provided to the noninverting input by the resistor to ground while a DC path is provided to the inverting input by the output terminal (by feedback).

For the low-pass filter (op amp on the right) a DC path is provided to the noninverting input by the resistors to the output of the operational amplifier on the left while a DC path is provided to the inverting input by the output terminal (by feedback).

Best regards,

G. Goodwin