2000•Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIERequires access
Design consideration and performance of a digital lock-in amplifier with 68HC11 microcontroller
Ioan Burda, Simion Şimon, Mihai Todica, Gheorghe Cristea, Georgeta Cerbanic, Lavinia Cociu
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Abstract
The lock-in amplifier technique is frequently use din characterization of optoelectronic devices. A digital lock- in amplifier and a digital direct synthesis signal generator are implemented with a general propose 68HC11E1FN microcontroller. The resolution in frequency is less than 1 Hz. The digital lock-in amplifier over a frequency range from 1 Hz to 1 kHz and can measure signal at any harmonic of the reference signal. Typical error is less than 0.5 percent for the range of frequencies reported. This digital lock-in technique is inexpensive and can be used in experiments with low frequency response.