High gain detector amplifier with enhanced dynamic range for single photon read-out of photodetectors
First Claim
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1. A single photon read-out circuit comprising:
- a feed-back enhanced reset amplifier, the amplifier comprising a detector reset transistor;
a photodetector connected to an output of the reset amplifier; and
a high-gain amplifier connected to the photodetector, the high-gain amplifier comprising;
a current source transistor connected to the photodetector;
an adaptive skimming circuit having an integration capacitor; and
a pixel reset transistor connected to the current source transistor and the adaptive skimming circuit.
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Abstract
An ultra-low noise, high gain interface pixel amplifier is provided with capability for single-photon readout of standard photodetectors at high electrical bandwidths for diverse spectral bandpass from the x-ray to long IR bands. The detector charge modulates a source follower whose output is double sampled to remove correlated noise by a compact stage that also provides optimum level shift for subsequent amplification of the full signal excursion. The level-shifted signal finally drives a compact amplifier that generates a robust end-to-end transimpedance. Single-photon readout of photodetectors at high electrical bandwidths in small pixel areas is thereby facilitated.
58 Citations
13 Claims
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1. A single photon read-out circuit comprising:
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a feed-back enhanced reset amplifier, the amplifier comprising a detector reset transistor;
a photodetector connected to an output of the reset amplifier; and
a high-gain amplifier connected to the photodetector, the high-gain amplifier comprising;
a current source transistor connected to the photodetector;
an adaptive skimming circuit having an integration capacitor; and
a pixel reset transistor connected to the current source transistor and the adaptive skimming circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A focal plane array (FPA) having a plurality of pixel cells, each pixel cell comprising:
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a feed-back enhanced reset amplifier, the feed-back amplifier comprising;
a CMOS inverter; and
a photodetector reset transistor connected to the CMOS inverter;
a photodetector connected to an output of the reset amplifier; and
a high-gain amplifier connected to the photodetector, the high-gain amplifier comprising;
a current source transistor connected to photodetector;
a pixel reset transistor connected to the current source transistor; and
an adaptive skimming circuit having an integration capacitor;
wherein the reset amplifier reduces kTC noise, and the high-gain amplifier nulls current associated with the photodetector to reduce signal non-uniformity.
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9. A single photon read-out circuit comprising:
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a detector;
a detector reset transistor having a drain connected to the detector;
an inverter amplifier connected between the drain of the reset transistor and a source of the reset transistor;
a current source transistor having a gate connected to the detector;
a pixel reset transistor having a drain connected to the current source transistor; and
an adaptive skimming circuit connected to the current source transistor and the pixel reset transistor, the adaptive skimming circuit comprising an integration capacitor. - View Dependent Claims (10, 11, 12, 13)
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Specification