parallel feedback造句

In circuits with negative parallel feedback ( e . g ., an inverting amplifier ), the virtual ground at the inverting input separates the input source from the op-amp output.
"' Modified input voltage ( parallel feedback ) : "'when the input voltage crosses the threshold in some direction the circuit changes the very input voltage in the same direction ( now it adds a part of its output voltage directly to the input voltage ).
It's difficult to find parallel feedback in a sentence. 用parallel feedback造句挺难的