The present invention is related to a device comprising a capacitive feedbacktransimpedance operational amplifier (11), that comprises a main operationalamplifier (107) (with a first input (121), a second input (122) and an output(125)) and an integrating capacitor (106), connected between the second inputand the output, and a first switch (105) connected in parallel to theintegrating capacitor (106). The device further comprises an auto-zerooperational amplifier (110) having a third input (123) and a fourth input(124), whereby to the third input (123) and the first input (121) signals atvirtual ground potential are applied. The fourth input (124) is connected tothe output (125) by a circuit (15) comprising two offset error capacitors(112, 114), a second switch (111) and a third switch (113).(Figure 3)
展开▼
