Preamplifier circuit for a photodetector
OwnerKevin Scott Buescher, James Harold Lauffenburger +1inventors
InventorsKevin Scott Buescher, James Harold Lauffenburger, John William Arachtingi
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Abstract
An amplifier circuit (20) for a photodetector includes a transconductance variable gain stage (32). The transconductance variable gain stage (32) has an input (34) capable of connecting to the photodetector and an output (40). A transconductance gain stage (44) has an input (42) connected to the output (40) of the transconductance variable gain stage (32). A feedback resistor (46) is connected between an output (48) of the transconductance gain stage (44) and the input (42) of the transconductance gain stage (44).
Claims19
An amplifier circuit for a photodetector comprising:
- a transconductance variable gain stage having an input capable of connecting to the photodetector and an output;
- a transconductance gain stage having an input connected to the output of the transconductance variable gain stage;
- and
- a feedback resistor connected between an output of the transconductance gain stage and the input of the transconductance gain stage.
An amplifier circuit for a photodetector comprising:
- a transconductance variable gain stage having an input capable of connecting to the photodetector;
- a transconductance gain stage having an input connected to an output of the transconductance variable gain stage;
- a feedback resistor connected between an output of the transconductance gain stage and the input of the transconductance variable gain stage;
- and
- a variable feedback resistor connected to the input of the transconductance variable gain stage and to the output of the transconductance gain stage.
An amplifier circuit for a photodetector comprising:
- a differential amplifier having an input capable of connecting to the photodetector;
- a variable gain positive current mirror connected to the differential amplifier;
- and
- a variable gain negative current mirror connected to the differential amplifier.
The amplifier of claim of 16, further including a transconductance gain stage connected to an output of the variable gain positive current mirror.
Dependencies are inferred from the claim text.