3 research outputs found
An open-source high-frequency lock-in amplifier
We present characterization of a lock-in amplifier based on a field
programmable gate array capable of demodulation at up to 50 MHz. The system
exhibits 90 nV/sqrt(Hz) of input noise at an optimum demodulation frequency of
500 kHz.The passband has a full-width half-maximum of 2.6 kHz for modulation
frequencies above 100 kHz. Our code is opensource and operates on a
commercially available platform
Dual-Phase Lock-In Amplifier Based on FPGA for Low-Frequencies Experiments
Photothermal techniques allow the detection of characteristics of material without invading it. Researchers have developed hardware for some specific Phase and Amplitude detection (Lock-In Function) applications, eliminating space and unnecessary electronic functions, among others. This work shows the development of a Digital Lock-In Amplifier based on a Field Programmable Gate Array (FPGA) for low-frequency applications. This system allows selecting and generating the appropriated frequency depending on the kind of experiment or material studied. The results show good frequency stability in the order of 1.0 Ă 10â9 Hz, which is considered good linearity and repeatability response for the most common Laboratory Amplitude and Phase Shift detection devices, with a low error and standard deviation