| 摘要 |
The acquisition circuit comprises a second and third electronic switch connected in series between a photodetector and a first input terminal of an amplifier. A reference voltage is applied to a second input terminal of the amplifier, the reference voltage being applied between the photodetector and the second electronic switch by means of a fourth electronic switch. An integration capacitor and a first electronic switch are connected in parallel between the first input terminal and an output terminal of the amplifier. A buffer capacitor is connected between a common terminal of the second and third electronic switches and a secondary voltage. The electrical capacitance of the buffer capacitor is at least equal to that of the integration capacitor.
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