I am trying to use LM2907 to convert a frecuency signal into a voltage signal. The frequency signal comes from a motor encoder and it´s supposed to be connected to pin 1 from the LM2907, but I am getting an error that is coming from this connection, as it disappears when I leave the pin opened. I already changed the SPICE options from Default to Settings for better convergence but I´m still getting the same error.
Here is the circuit I am trying to simulate , where Vpp is a 12 V rail and FV is the output of the LM2907
This is the error log:
[SPICE] Gmin step [61 of 120] failed: GMIN=2.76482e-007
[SPICE] Gmin stepping failed
[SPICE] Source step [0 of 120] failed: source factor = 0.0000
[SPICE] Too many iterations without convergence.
Real Time Simulation failed to start.