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请教这个比较器的电气符号,其同相、反相输入端怎么判断?

Other Parts Discussed in Thread: UC3842

最近在看UC3842内部原理框图时,看到有一个比较器的符号,如下图红框里的:

同相输入端是带小圈这个吗?这个比较器符号是哪种标法?不是IEC的,也不是GB的。