Dongyue Wu Chao Wang 0019 Hongjun Sun Huaxiang Wang A Novel Digital Lock-in Amplifier with Dual Channels. 464-468 2009 CAR https://doi.org/10.1109/CAR.2009.24 https://doi.ieeecomputersociety.org/10.1109/CAR.2009.24 conf/car/2009 db/conf/car/car2009.html#WuWSW09