| 摘要 |
A charge measurement circuit 20 includes a charge sensitive amplifier 40 which holds the input 42 at a constant voltage. A compensation circuit 72, 74, 76, 80 enables a current to be supplied to or drained from a charge supplying circuit 32. This current is selected such that any voltage mismatch between the output of the supplying circuit 32 and the input 42 of the measurement circuit 20 does not result in a charge flow which causes errors in the measured signal.
|
