Low-noise and long-range PIR sensor conditioner circuit CIRCUIT060004 (ACTIVE)

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Key Document


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.

  • Single 5V Supply 
  • Passes frequencies between 0.7Hz - 10Hz 
  • AC Gain: 90dB

Technical Documents
Application notes (3)
Title Type Size (KB) Date
PDF 192 30 Dec 2018
PDF 479 12 May 2017
PDF 115 06 Mar 2017
User guides (5)
Title Type Size (KB) Date
PDF 2851 19 Nov 2018
PDF 8350 16 Oct 2017
PDF 3842 28 Feb 2017
PDF 4402 15 Dec 2016
PDF 3439 25 Oct 2016
Solution guides (1)
Title Type Size (KB) Date
PDF 11259 18 Feb 2019

Software (1)

Development Tools (2)

Name Part Number Tool Type
Analog engineer's calculator  ANALOG-ENGINEER-CALC  Calculation Tools 
SPICE-based analog simulation program  TINA-TI  Circuit Design & Simulation 

TI Devices (2)

Part Number Name Product Family
OPA376  Precision, Low Noise, Low Iq Operational Amplifier  Operational amplifiers (op amps) 
TLV9062  10-MHz, low-noise, RRIO, CMOS operational amplifier for cost-sensitive systems  Operational amplifiers (op amps) 

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