Photoelectric differential detector with high common-mode rejection ratio (CMRR)
A high common-mode rejection and detector technology, which is applied in the direction of photometry and measurement circuits using electric radiation detectors, can solve the problems of single technology, inability to reduce and eliminate photodiode response differences, etc.
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[0027] According to the above principles and diagrams, the present invention provides a specific implementation method.
[0028] a) Twin photodiodes S1336-10BQ with a pairing accuracy of 1% from Hamamtsu are selected as the photodiodes D21 and D22 of the differential photodetector, which have the advantages of wide spectral response, large receiving area, and ultra-low noise.
[0029] b) A precision adjustable resistor T93YA101KT20 from Vishay Company with a resistance value of 100Ω is selected as the adjustable resistor VR26 of the differential fine-tuning circuit 28 .
[0030] c) Select two metal film resistors CMF5010K000BEEB from Vishay with a resistance value of 10Ω as the fixed resistance resistors R23 and R24 of the differential trimming circuit 28 .
[0031] d) Select TI's OPA129U low-input bias current, low-noise operational amplifier as the OPA27 of the photoelectric differential detector.
[0032] e) Select Vishay's CMF55100K00BEEB metal film resistor with a resist...
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