Radiant energy – Inspection of solids or liquids by charged particles – Analyte supports
Patent
1979-10-15
1981-07-14
Anderson, Bruce C.
Radiant energy
Inspection of solids or liquids by charged particles
Analyte supports
250363S, G01T 120
Patent
active
042788897
ABSTRACT:
The current amplifier with automatic drift correction is designed for use in conjunction with computerized tomographic scanners or other apparatus. The amplifier comprises a differential amplifier with a first input connected to a photodiode or other source of current to be amplified. An integrating amplifier is connected between the differential amplifier output and a second differential amplifier input. The integrating amplifier has a time constant which is long compared with the period during which the diode current is to be amplified to provide automatic drift correction. A feedback loop connects the output of the differential amplifier with the first differential amplifier input. The feedback loop comprises a pair of matched transistors interconnected to form a current mirror. A first resistor connects the current mirror with ground. Current flow through these two resistors is summed to form the current flow received by the current mirror. The mirror current generated by the current mirror forms the amplifier output signal.
REFERENCES:
patent: 3980886 (1976-09-01), Stout
patent: 4068306 (1978-01-01), Chen et al.
patent: 4070581 (1978-01-01), Gibbons et al.
patent: 4071760 (1978-01-01), LeMay
patent: 4114042 (1978-09-01), LeMay
patent: 4138640 (1979-02-01), Cousins
patent: 4145610 (1979-03-01), Perilhou
Harris Semiconductor, Linear and Data Acquisition Products, p. 7-70 and p. 7-71.
Anderson Bruce C.
Ohio Nuclear Inc.
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