Patent ID: 7256384
Filing Date: 2007-08-14
Classification: H03F,H03G

Abstract:
1. An apparatus for enhancing electronic signals from a photodetector comprising: an amplifier; a clamp circuit connected to the output of the amplifier; a programmable gain amplifier connected to the clamp circuit; a filter connected to the programmable gain amplifier; a notch filter connected to the filter; an analog-to-digital converter connected to the notch filter; an inverting-summing amplifier connected to the amplifier and configured to provide a negative DC offset and DC signal cancellation to the amplifier; a course adjustment digital-to-analog converter connected to an input of the inverting-summing amplifier; a fine adjustment digital-to-analog converter connected to another input of the inverting-summing amplifier; at least one DC reference generator configured to provide voltage references to the digital-to-analog converters;and a computer, wherein the computer provides control signals for and is connected to the analog-to-digital converter, the programmable gain amplifier, the filter, the notch filter, course adjustment digital-to-analog converter and the fine adjustment digital-to-analog converter; and the computer provides feedback control and digital filtering for the apparatus.