A new type of lock-in amplifier detecting circuit

作者：Lin Ling^*; Wang Xiao Lin; Li Gang; Wang Shuo; Liu Ming

来源：Journal of Tianjin University, 2005, 38(1): 65-68.

• Lock-in amplifiers
• Micro-processing unit (MPU)
• Phase sensitive detectors
• Weak signal detection

Lock-in amplifying (LIA) is one of important means for weak signal detection. However, there are still some problems remained in conventional LIA, such as high circuit parameter dependence and low application flexibility of analogue LIA, and algorithmic complexity of digital LIA. A new type of LIA detecting circuit is presented in this paper, which combines the advantages of conventional LIA with characteristics of over-sampling and integration of Σ-Δ A/DC. It is theoretically analyzed and proved through experiment that this circuit is better in performance than conventional LIA. Another outstanding feature of the circuit is that it collects and transfers data from/to micro-processing unit (MPU) seamlessly.

• 出版日期2005
• 单位天津大学