PYROELECTRIC DETECTOR FEEDBACK AMPLIFIER LOW FREQUENCY RESPONSE

摘要

A pyroelectric circuit (10) includes a pyroelectric sensor element (14) connected to a load resistor (RL) and to an input (G) of a buffer amplifier (16) having a feedback path (C) for multiplying the resistance of the load resistor at non-zero frequencies. This feedback enables use of a smaller load resistor which is multiplied to produce a higher effective load resistance necessary for proper low frequency response of the detector circuit.