Detector circuit with a stationary potential amplifier input
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United States of America Patent
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Oct 9, 2001
Grant Date -
N/A
app pub date -
Nov 12, 1999
filing date -
Dec 22, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The detector circuit (11) of a radiation-sensitive sensor (10) with capacitive high pass coupling (14) between a pre-amplifier (13) and a signal amplifier (15) is blocked for a prolonged period of time (T2) even after termination of an overexcitation effect, because of the high filter time constant of the series capacitor (25), because the capacitor (25) only slowly experiences charge reversal and therefore the signal amplifier (15) following it initially still remains overdriven until the capacitor (25) has reversed charge again to a dc voltage level in the actuation range (39) of the signal amplifier (15). That dead time period (T2) is however curtailed to a short fraction (T1) if upon termination of overexcitation at the input side the capacitor (25) at the output side, that is to say upstream of the signal amplifier (15), is forcibly returned to the--virtual--ground potential at the amplifier input, for potential reduction purposes, by way of a low-resistance switching section (31). Such charge reversal can also be triggered under software control if no useful signals (17) which can be utilised have occurred over a relatively long period of time because for example permanently high actuation of the sensor (10) has resulted in an excessive potential displacement at the coupling capacitor (25).
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