Charge measurement circuit which includes a charge sensitive amp

Details Charge measurement circuit which includes a charge sensitive amp Charge measurement circuit which includes a charge sensitive amp

1997-09-26

1999-08-31

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

348308, 348311, H01J 4014

Patent

active

059456639

ABSTRACT:
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.

REFERENCES:
patent: 5572015 (1996-11-01), Bird et al.
patent: 5608205 (1997-03-01), Bird et al.
patent: 5721422 (1998-02-01), Bird
patent: 5856666 (1999-01-01), Moulsley

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