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A High Performance LIA-Based Interface for Battery Powered Sensing Devices.

Daniel García-Romeo¹, María R Valero², Nicolás Medrano³

¹Group of Electronic Design, Aragon Institute for Engineering Research, I3A, Facultad de Ciencias, Pedro Cerbuna 12, Zaragoza 50009, Spain. dgromeo@unizar.es.

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|October 6, 2015

Summary

This summary is machine-generated.

This study introduces a novel, low-power electronic interface using a general purpose lock-in amplifier (LIA) for MHz signal recovery. The system offers high accuracy and efficiency for battery-operated devices.

Keywords:

CMOS analog integrated circuits gas sensing low-voltage low power portable lock-in amplifiers

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Area of Science:

Electronics
Instrumentation
Microfabrication

Background:

Lock-in amplifiers (LIAs) are crucial for extracting weak signals from noisy environments.
Existing LIAs often have limitations in power consumption, size, and frequency range for portable applications.

Purpose of the Study:

To develop a battery-compatible electronic interface with a general purpose lock-in amplifier (LIA).
To achieve high-frequency signal recovery (up to MHz range) with low power consumption.
To demonstrate the LIA's performance and applicability in sensor measurements.

Main Methods:

Designed and fabricated a novel Application-Specific Integrated Circuit (ASIC) using 1.8 V 0.18 µm CMOS technology.
Implemented a dual-phase analog lock-in amplifier with configurable building blocks for wide frequency operation.
Utilized square input signals for enhanced simplicity and power efficiency in microcontrolled systems.

Main Results:

Achieved signal recovery with signal-to-noise power ratios down to -39 dB.
Demonstrated relative errors below 0.07% for signals up to 1 MHz.
Successfully measured microcantilever-based resonant sensor response, showing a superior power-bandwidth trade-off compared to existing solutions.

Conclusions:

The proposed LIA-based interface is highly effective for battery-operated systems requiring MHz signal recovery.
The novel ASIC design offers significant advantages in terms of power consumption, size, and performance.
This technology presents a competitive alternative to commercial off-the-shelf (COTS) LIA components and equipment.