Weak current detection circuit for photodiode
The weak current detection circuit comprises a pre-stage amplification circuit and a post-stage amplification circuit, the pre-stage amplification circuit is provided with a first operational amplifier, and a first pin of the first operational amplifier is electrically connected with the post-stage...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The weak current detection circuit comprises a pre-stage amplification circuit and a post-stage amplification circuit, the pre-stage amplification circuit is provided with a first operational amplifier, and a first pin of the first operational amplifier is electrically connected with the post-stage amplification circuit through a resistor. The first pin is reversely connected with a fourth pin of the first operational amplifier through the feedback resistor, a third pin of the first operational amplifier is grounded, and the fourth pin is electrically connected with the output end of the photodiode; the post-stage amplification circuit is provided with a second operational amplifier, the second operational amplifier comprises a first channel and a second channel, a first pin of the first channel is electrically connected with a fifth pin of the second channel through a filter circuit, and the first pin of the first channel is reversely connected with a second pin of the first channel through a feedback resist |
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