[电] locked-in oscillator

gù dìng zhèn dàng qì tǎ zhuàn zǐ diàn liú ㄍㄨˋ ㄉㄧㄥˋ ㄓㄣˋ ㄉㄤˋ ㄑㄧˋ ㄊㄚˇ ㄓㄨㄢˋ ㄗˇ ㄉㄧㄢˋ ㄌㄧㄡˊ