Apparatus for detecting illumination levels
First Claim
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1. An apparatus comprising:
- a single photon avalanche diode pixel comprising a single photon avalanche diode and output transistor circuitry configured to provide an analog output current from the single photon avalanche diode, wherein the output transistor circuitry comprises;
a quench transistor coupled to an anode of the single photon avalanche diode, anda pull-up transistor coupled to the anode of the single photon avalanche diode;
wherein the single photon avalanche diode pixel is configured to operate in a first mode to output a digital single photon detection event;
wherein the single photon avalanche diode pixel is further configured to operate in a second mode to output the analog output current indicating a level of illumination of the single photon avalanche diode pixel;
wherein the output transistor circuitry is configured to provide the analog output current to an input of a trans-impedance amplifier, the input of the trans-impedance amplifier coupled to the anode of the single photon avalanche diode; and
wherein;
in the first mode, the pull-up transistor is off, andin the second mode, the quench transistor is off and the pull-up transistor is on.
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Abstract
An apparatus includes a single photon avalanche diode pixel that includes a single photon avalanche diode and an output transistor configured to provide an analog output current from the single photon avalanche diode. The single photon avalanche diode pixel is configured to operate in a first mode to output a digital single photon detection event. The single photon avalanche diode pixel is further configured to operate in a second mode to output the analog output current indicating a level of illumination of the pixel.
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Citations
22 Claims
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1. An apparatus comprising:
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a single photon avalanche diode pixel comprising a single photon avalanche diode and output transistor circuitry configured to provide an analog output current from the single photon avalanche diode, wherein the output transistor circuitry comprises; a quench transistor coupled to an anode of the single photon avalanche diode, and a pull-up transistor coupled to the anode of the single photon avalanche diode; wherein the single photon avalanche diode pixel is configured to operate in a first mode to output a digital single photon detection event; wherein the single photon avalanche diode pixel is further configured to operate in a second mode to output the analog output current indicating a level of illumination of the single photon avalanche diode pixel; wherein the output transistor circuitry is configured to provide the analog output current to an input of a trans-impedance amplifier, the input of the trans-impedance amplifier coupled to the anode of the single photon avalanche diode; and wherein; in the first mode, the pull-up transistor is off, and in the second mode, the quench transistor is off and the pull-up transistor is on. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for operating a single photon avalanche diode pixel that comprises a single photon avalanche diode and output transistor circuitry, the method comprising:
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configuring the single photon avalanche diode pixel to operate in a first mode to output a digital single photon detection event by turning off a pull-up transistor of the output transistor circuitry, the pull-up transistor being coupled to an anode of the single photon avalanche diode; and configuring the single photon avalanche diode pixel to operate in a second mode by; turning off a quench transistor of the output transistor circuitry, the quench transistor being coupled to the anode of the single photon avalanche diode, turning on the pull-up transistor, and configuring the output transistor circuitry to provide an analog output current from the single photon avalanche diode indicating a level of illumination of the single photon avalanche diode pixel to an input of a trans-impedance amplifier, the input of the trans-impedance amplifier coupled to the anode of the single photon avalanche diode. - View Dependent Claims (15, 16)
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17. An apparatus for operating a single photon avalanche diode pixel that comprises a single photon avalanche diode and an output transistor circuitry, the apparatus comprising:
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means for configuring the single photon avalanche diode pixel to operate in a first mode to output a digital single photon detection event by turning off a pull-up transistor of the output transistor circuitry, the pull-up transistor being coupled to an anode of the single photon avalanche diode; and means for configuring the single photon avalanche diode pixel to operate in a second mode by; turning off a quench transistor of the output transistor circuitry, the quench transistor being coupled to the anode of the single photon avalanche diode, turning on the pull-up transistor, and configuring the output transistor circuitry to provide an analog output current from the single photon avalanche diode indicating a level of illumination of the single photon avalanche diode pixel to an input of a trans-impedance amplifier, the input of the trans-impedance amplifier coupled to the anode of the single photon avalanche diode. - View Dependent Claims (18, 19)
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20. An apparatus comprising:
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a plurality of rows of single photon avalanche diode pixels, each single photon avalanche diode pixel comprising a single photon avalanche diode and respective output transistor circuitry configured to provide an analog output current from the respective single photon avalanche diode, wherein each output transistor circuitry comprises;
a respective quench transistor coupled to an anode of the respective single photon avalanche diode, and a respective pull-up transistor coupled to the anode of the respective single photon avalanche diode, wherein the single photon avalanche diode pixels are arranged as sets of single photon avalanche diode pixels, wherein each single photon avalanche diode pixel is configured to operate in a first mode to output a digital single photon detection event, wherein, in the first mode, the respective pull-up transistor is off, and wherein each single photon avalanche diode pixel is further configured to operate in a second mode to output the analog output current indicating a level of illumination of the single photon avalanche diode pixel, wherein, in the second mode, the respective quench transistor is off and the respective pull-up transistor is on; anda plurality of trans-impedance amplifiers, each trans-impedance amplifier having an input coupled to receive the analog output current from each single photon avalanche diode pixel of a respective one of the sets of single photon avalanche diode pixels, wherein each trans-impedance amplifiers is respectively coupled to anodes of single photon avalanche diodes of single photon avalanche diode pixels. - View Dependent Claims (21, 22)
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Specification