How to construct equations according to the circuit

[xiaowenrun]

Hello everyone
Recently, I've been building equations based on circuits. I don't understand the parasitic capacitance of transistors. like cij=dQi/dVj. Then I will write the equation according to KCL. I would say s*caa*va + s*cab*vb = 0 if only parasitic capacitance is considered and suppose that there are only two nodes in the circuit. But when I applied this principle to the construction of my circuit equation, I found that I couldn't get the correct result. Can anyone tell me what is wrong?

 

[andre_luis]

In electronics, a circuit is usually presented graphically, not textually;
how about you make a sketch of what you're talking about?