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A low-noise large dynamic-range current preamplifier for photodiode current signals is presented. The circuit is equipped with a smart device for automatic removal of the DC current of the photodiode. This device sinks away the exact amount of DC current from the preamplifier input, yielding auto zeroing of the output-voltage offset, while introducing the minimum electronic noise possible. As a result...
A circuit technique is presented which eliminates the offset error in the output voltage of low-noise charge preamplifiers for ionising radiation sensors. Offset cancellation is obtained actively through a negative feedback path whose “error” variable is the offset itself. As a result the output voltage offset is automatically eliminated with no trimming, irrespective of the bias point of the input...
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