我把电路的传递函数写出来后，做小信号分析时，报告如下错误。
“dc
*** ERROR "ALG_SINGULAR_JACOBIAN" *** Singular Jacobian matrix.
Some possible causes for a singular Jacobian matrix:
- Model operating outside of its intended region of operation.
- Node/subsystem with no connection to the reference (floating).
- Current loops (voltage sources/inductors in parallel).
- Missing equation and/or missing variable reference.
Potential problem variables/equations:
/x2(tf_ra_poly2.tf_ra_poly2_4)
/x2(tf_ra_poly2.fvea)
/x1(tf_ra_poly2.tf_ra_poly2_4)”
请问这是什么原因？tf_ra_poly2.tf_ra_poly2_4和tf_ra_poly2.fvea是
两个二阶传递函数，请问这里的“/X2”和“/X1”是什么意思？谢谢了
