A complete low voltage analog lock-in amplifier to recover sensor signals buried in noise for embedded applications
نویسندگان
چکیده
This paper presents a complete low-voltage 3V single supply analog lock-in amplifier (LIA) based on phase sensitive detection technique (PSD) for processing AC sensor signals buried in noise in embedded wireless applications. Reference and bias sensor signals are provided by a quadrature oscillator. Experimental results confirm the capability of the proposed lock-in amplifier to effectively recover information from signal to noise ratios below -32 dB with errors below 9%. This general system is valid to work both for resistive to capacitive sensors. In addition, the system presents three different power modes that permit extending the battery operation lifetime of the system.
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