| 摘要 |
<p>Conventional analog and digital charge amplifiers for converting a charge output by a piezoelectric sensor into a proportional voltage require analog integration which inherently involves a drift in the output signal. In order to avoid this, a digital charge amplifier (1) is proposed in which, depending on the output of a comparator (5), a positive or negative constant feedback current (if) is fed back to the input (2) and the input current (ie) is compensated, wherein a counter (7) detects the time period during which a feedback current (if) is flowing.</p> |
