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CIRCUIT060004

Low-noise and long-range PIR sensor conditioner circuit

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CIRCUIT060004

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Overview

This two stage amplifier design amplifies and filters the signal from a passive infrared (PIR) sensor. The circuit includes multiple low–pass and high–pass filters to reduce noise at the output of the circuit to be able to detect motion at long distances and reduce false triggers. This circuit can be followed by a window comparator circuit to create a digital output or connect directly to an analog–to–digital converter (ADC) input.
Features
  • Single 5V Supply 
  • Passes frequencies between 0.7Hz - 10Hz 
  • AC Gain: 90dB

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  1. Read the circuit design and circuit design with MSP430™ smart analog combo
  2. Download the model

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Design tool

Simulation for Low-noise and Long-Range PIR Sensor Conditioner Circuit — SBOC524.ZIP (329KB)

Release date: 05-Jul-2018
Supported products & hardware
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Supported products & hardware

General-purpose op amps
TLV9062 — Dual, 5.5-V, 10-MHz operational amplifier
MSP430 microcontrollers
MSP430FR2310 — 16 MHz integrated analog microcontroller with 2 KB FRAM, OpAmp, TIA, comparator with DAC, 10-bit ADC MSP430FR2311 — 16-MHz integrated analog microcontroller with 3.75-KB FRAM, OpAmp, TIA, comparator w/DAC, 10-bit ADC MSP430FR2353 — 24 MHz 105 C integrated analog microcontroller with 16 KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD MSP430FR2355 — 24-MHz 105-C integrated analog microcontroller with 32-KB FRAM, Op-Amps/PGAs, 12-bit DACs, 12-bit AD
Precision op amps (Vos<1mV)
OPA376 — Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Technical documentation

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Type Title Date
* Application note Low-noise long-range PIR sensor conditioner circuit MSP430 smart analog combo (Rev. A) Mar. 06, 2020
* Application note Low-noise and long-range PIR sensor conditioner circuit (Rev. A) Feb. 29, 2020
Application note How to Use the Smart Analog Combo in MSP430™ MCUs (Rev. A) Oct. 24, 2019
E-book Analog Engineer’s Circuit Cookbook: Amplifiers (Rev. A) Feb. 18, 2019
Design guide Low-Noise PIR Signal Chain Reference Design With Less False Alarm Nov. 19, 2018
Design guide Advanced Motion Detector Using PIR Sensors Reference Design for False Triggers (Rev. B) Oct. 16, 2017
Application note Design of Ultra-Low Power Circuits for Battery-Powered Wireless PIR Motion Detec (Rev. A) May 12, 2017
Application note Cost-Optimized Opamp Window Comparator for Ultra-low Power PIR Motion Detectors Mar. 06, 2017
Design guide Ultra-Low-Power Wireless PIR Motion Detector Reference Design Feb. 28, 2017
Design guide Low-Power PIR Motion Detector With 10-Year Coin Cell Battery Design Guide (Rev. B) Dec. 15, 2016
Design guide Low-PWR PIR Motion Detector w/ Sub1GHz Wireless Connectivity for 10-Yr Batt Life (Rev. B) Oct. 25, 2016

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