Warning detected by hpeesofsim during DC analysis `HB1'.Matrix is singular (detected at node or branch `X4.L17.i').
Warning detected by hpeesofsim during DC analysis `HB1'.Circuit converged after a virtual resistance of 1 TOhms was added between each node and ground, and a virtual resistance of 1 pOhms was inserted in each current branch.Possible causes include floating nodes or missing ground.
我是在仿真倍频器上出现的，知情者解答之，万分感谢！
好像是说仿真不能够收敛，建议你检查是不是有悬空的节点（floationg node）或者缺少接地（missing ground）
把你的schematic附上！
仿真有频谱出现，而且大致也够理想，不知道这个警告怎么解决，没有悬空的节点（floationg node）和缺少接地（missing ground）
八成是参数设错了或电路练错了，你再对比教程仔细看看
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