A lock in pinned photodiode photodetector includes a plurality of output ports which are sequentially enabled. Each time when the output port is enabled is considered to be a different bin of time. A specified pattern is sent, and the output bins are investigated to look for that pattern. The time when the pattern is received indicates the time of flight A CMOS active pixel image sensor includes a plurality of pinned photodiode photodetectors that use a common output transistor. In one configuration, the charge from two or more pinned photodiodes may be binned together and applied to the gate of an output transistor.
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0. 26. A CMOS active image sensor comprising:
a first pinned photodiode of a first pixel for accumulating charge therein wherein the first pinned photodiode of the first pixel occupies a first row of an array of photodiodes;
a first transistor for transferring charge from the first pinned photodiode directly to a first diffusion region;
a second pinned photodiode of a second pixel for accumulating charge therein wherein the second pinned photodiode of the second pixel occupies a second row, below the first row, of the array;
a second transistor for transferring charge from the second pinned photodiode directly to the first diffusion region;
a third pinned photodiode of a third pixel for accumlating charge therein wherein the third pinned photodiode of the third pixel occupies a third row, below the second row, of the array;
a third transistor for transferring charge from the third pinned photodiode directly to a second diffusion region, separate from the first diffusion region;
a fourth pinned photodiode of a fourth pixel that accumulates charge therein wherein the fourth pinned photodiode of the fourth pixel occupies a fourth row, below the third row, of the array;
a fourth transistor that transfers charge from the fourth pinned photodiode directly to the second diffusion region;
the first diffusion region configured to apply charge to a gate of a fifth transistor coupled between a supply voltage and an output; and
the second diffusion region configured to apply charge to the gate of the fifth transistor, wherein the fifth transistor is an in-pixel buffer transistors common to the first, second, third, and fourth pixels.
0. 1. A method, comprising:
accumulating photocarriers in each of a plurality of photocarrier integrators and successively enabling each of said plurality of photocarrier integrators to connect to a common photodiode, each of said photocarrier integrators connecting to said common photodiode through a respective photodiode output port, said plurality of photocarrier integrators accumulating photocarriers generated by said photodiode during different time periods from one another.
0. 2. A method as in
0. 3. A method as in
0. 4. A method as an
0. 5. A method as in
0. 6. A method as in
0. 7. A method, comprising:
generating photocarriers in a photodiode within a pixel during a plurality of time periods;
accumulating photocarriers in each of a plurality of photocarrier integrators within said pixel such that each photocarrier integrator accumulates photocarriers generated during a time period different from a time period in which other photocarrier integrators accumulate photocarriers; and
sampling said photocarriers from said photocarrier integrators;
determining a range of an object using said sampled photocarriers.
0. 8. A method as in
0. 9. A method as in
0. 10. A method as in
0. 11. A method as in
0. 12. A method, comprising:
sampling a plurality of different samples of light in a photodiode, each of said plurality of different samples being 90 degrees out of phase with one another; and
successively gating photocarriers representing each of said different samples from said photodiode through a respective output port, each output port associated with a respective photocarrier integrator, such that each photocarrier integrator accumulates a different sample than other of said photocarrier integrators.
0. 13. A method as in
0. 14. A method as in
0. 15. A method as in
0. 16. A method of operating a range finding sensor, the method comprising;
providing a plurality of photodiodes, each photodiode having a first output port for switchably coupling each respective photodiode to a first photocarrier integrator in a same pixel as said photodiode and a second output port for switchably coupling each photodiode to a second photocarrier integrator in a same pixel as said photodiode;
generating first photocarriers in said photodiodes in response to light received during a first time period;
transferring said first photocarriers to respective first photocarrier integrators via said first output ports;
generating second photocarriers in said photodiodes in response to light received during a second time period; and
transferring said second photocarriers to respective second photocarrier integrators via said second output ports.
0. 17. The method of
0. 18. The method of
0. 19. The method of
0. 20. The method of
0. 21. The method of
0. 22. The method of
0. 23. The method of
generating third photocarriers in said photodiodes in response to light received during a third time period;
transferring said third photocarriers to respective third photocarrier integrators via said third output ports;
generating fourth photocarriers in said photodiodes in response to light received during a fourth time period; and
transferring said fourth photocarriers to respective fourth photocarrier integrators via said fourth output ports.
0. 24. The method of
0. 25. The method of
0. 27. The CMOS active image sensor of claim 26 wherein the first transistor and the second transistor are configured to be turned on during a same period of time during operation of the image sensor.
0. 28. The CMOS active image sensor of claim 27, wherein the third transistor and the fourth transistor are configured to be turned on during a same period of time during operation of the image sensor.
0. 29. The CMOS active image sensor of claim 26, wherein the first and second diffusion regions are reset via a single reset transistor.
0. 30. The CMOS active image sensor of claim 29 further comprising in-pixel selection transistors.
0. 31. The CMOS active image sensor of claim 26 further comprising in-pixel selection transistors.
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5,471,505
where L1, L2, L3 and L4 are the amplititudes of the samples from the respective first, second, third and fourth integrators. These four phases are obtained from the four outputs of the photodiode.
The first pinned photodiode 100 is connected to an output drain 102 via gate 1, element 104. This receives the charge for the first bin. Similarly, gates 2, 3 and 4 are turned on to integrate/bin from the second, third and fourth periods.
It is important to obtain as much signal as possible from the photodiode. This can be done by using a large photodiode. However, it can take the electrons a relatively long time to escape from a large photodetector.
The present system divides the one larger photodiode into a number of smaller diodes, each with multiple output ports.
A number of subpixels are formed. Each includes a number of pinned photodiodes 200, each with four parts. Each of the corresponding ports are connected together in a way that allows summing the outputs of the photodiodes. For example, all the gate 1 control lines are connected together as shown. The outputs from all the port 1s are also summed, and output as a simple composite output. Similarly, ports 2, 3 and 4's are all summed.
Assuming the operation frequency of modulated light is 10 megahertz with a 25 nanosecond integration slot, the generator carrier has a time of flight within this limit. This resolution time constrains the size of the detector. In addition, the characteristic diffusion time in a semiconductor device is L2/D, where D is the diffusion coefficient. This time originates from the continuity equation and the diffusion equation, and defines how soon the steady state will be established in the area of size L. Hence, for a 10 cm square per second electron diffusion coefficient, the characteristic size of the pinned photodiode could be less than 5 microns.
Other embodiments are also contemplated to exist within this disclosure. For example, other numbers of output ports, e.g. 2-8, are possible. While this application describes using a pinned photodiode, similar operations could be carried out with other CMOS photodetectors, e.g., photodiodes and photogates.
Such modifications are intended to be encompassed within the following claims.
Fossum, Eric R., Berezin, Vladimir, Krymski, Alexander I.
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