| 摘要 |
The present invention is related to a device comprising a capacitive feedbac k transimpedance operational amplifier (11), that comprises a main operational amplifier (107) (with a first input (121), a second input (122) and an outpu t (125)) and an integrating capacitor (106), connected between the second inpu t and the output, and a first switch (105) connected in parallel to the integrating capacitor (106). The device further comprises an auto-zero operational amplifier (110) having a third input (123) and a fourth input (124), whereby to the third input (123) and the first input (121) signals at virtual ground potential are applied. The fourth input (124) is connected to the output (125) by a circuit (15) comprising two offset error capacitors (112, 114), a second switch (111) and a third switch (113).(Figure 3)</SDOAB >
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