Abstract
The lock-in amplifier technique is frequently used in 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 operates 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% for the range of frequencies reported. This digital lock-in technique is inexpensive and can be used in experiments with low frequency response.
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