Abstract: This paper presents a full-wave rectifier using operational transconductance amplifiers（OTAs） as main active circuit for pyroelectric infrared detector.The circuit makes use of the characteristic of the differential amplifier inside the OTA and avoids the zero crossing distortion for use of ordinary rectifier circuits.And according to the small input voltage of OTA,we proposed a compensated OTA-based full-wave rectifier,which improve the limited input voltage swings and through adjusting bias currents can realize signal amplification after rectifying.This rectifier was used to large current broadband pyroelectric infrared detector.Simulation and experimental results demonstrate the performance of the proposed rectifier work stable,and the output achieve the expected result.