Electronic – Spice_ Capacitors in series

simulationspice

I try to simulate an RLC circuit depicted in the annexed file. I have noticed that ngspice is not able to compile two capacitors which are connected in series. The netlist is written as follows: 

    * The global plasma model
    VRF 0 1 SIN(0 100 0.275732
    CBC 2 1 5.25154
    Cs 3 2 0.1407107F
    RB 4 3 5.25154
    LB 5 4 212.692
    VG 0 5 dc 10
    .END

This circuit can't be solved transient. I get the following error or warning message : 

Warning: vrf: no DC value, transient time 0 value used 
Warning:singular  matrix: check nodes 2 and 2

I would be very grateful, if somebody can give me a Hint on what went wrong. best regard
Nina

Best Answer

Try putting large resistors (10M, say) in parallel with the capacitors, to give a DC path.

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