| 摘要 |
<p>An input circuit (30) for a charge detector having a sensor element (31, 41, 51), the input circuit comprising an amplifier (33, 42, 52) having an input terminal and an output terminal, the sensor element (31, 41, 51) being coupled to the input terminal for feeding a data signal thereto upon detection of a high energy particle and passing a leakage current in an absence of a high energy particle. A controlled current source (32, 40, 50) is coupled to the sensor element for feeding a major component of the leakage current therethrough, and a feedback resistor (34, 43, 53) is coupled across the input terminal and the output terminal of the amplifier for feeding a residual component of the leakage current to the sensor element. The controlled current source typically constituted by a MOSFET is responsive to a change in voltage across the feedback resistor for regulating the major component of the leakage current so as to maintain the residual component thereof substantially constant. <IMAGE></p> |
