US Patent No: 6,384,413
Number of patents in Portfolio can not be more than 2000
Focal plane infrared readout circuit
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May 7, 2002
Issued date -
Oct 13, 1999
filing date -
09/416,964
serial no -
In Force
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Abstract
An infrared imager, such as a spectrometer, includes multiple infrared photodetectors and readout circuits for reading out signals from the photodetectors. Each readout circuit includes a buffered direct injection input circuit including a differential amplifier with active feedback provided through an injection transistor. The differential amplifier includes a pair of input transistors, a pair of cascode transistors and a current mirror load. Photocurrent from a photodetector can be injected onto an integration capacitor in the readout circuit with high injection efficiency at high speed. A high speed, low noise, wide dynamic range linear infrared multiplexer array for reading out infrared detectors with large capacitances can be achieved even when short exposure times are used. The effect of image lag can be reduced.
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,515,003 Operational amplifier | 23 | 1995 | |
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Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Nov 7, 2013 |
| Fee | Large entity fee | small entity fee | micro entity fee |
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| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
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