Hello ^^

I attach the ac response and transient simulation result of my low pass filter. The circuit is exactly differential and symmatric. But the transient show different voltage swing. Could you help me to explain this problem? thank you very much

(1) ac response of LPF


(2) zoom in to cutoff frequency part


3) 3dB bandwidth


(4) transient simulation


5) zoom in to transient simulation



thank you very much