Detector circuit with a stationary potential amplifier input
US6300616A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1999 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Nov 12, 2019 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF42C13/02
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.