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1. WO2020109668 - DETECTOR CIRCUIT

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

CLAIMS:

1. An imaging system comprising:

- a detector substrate;

- at least one detector circuit comprising a capacitor coupled with the detector substrate, the capacitor arranged to collect an electrical charge from the detector substrate, and

- the imaging system further comprises at least one programmable current source, arranged to provide a neutralizing charge to the capacitor, wherein the imaging system is configured to select a value for the neutralizing charge in dependence of a frame number.

2. The imaging system in accordance with claim 1, wherein the detector substrate comprises a semiconductor substrate such as: a CdTe substrate, a GaAs substrate, a Si substrate, a Hgl2, or a Se substrate.

3. The imaging system according to any of claims 1 - 2, wherein the at least one programmable current source is configured to provide the neutralizing charge to the capacitor separately for each pixel or group of pixels.

4. The imaging system according to any of claims 1 - 3, wherein the imaging system is configured to select a value for the neutralizing charge separately for each pixel, or separately for each group of pixels.

5. The imaging system according to any of claims 1 - 4, wherein the imaging system is configured to select a value for the neutralizing charge in dependence of a temperature of the detector substrate.

6. The imaging system according to any of claims 1 - 5, wherein the imaging system is configured to select a value for the neutralizing charge in dependence of at least one of: a current incident radiation dose and a cumulative incident radiation dose.

7. The imaging system according to any of claims 1 - 6, wherein the at least one programmable current source is configured to provide the neutralizing charge during a part of a charge collection time of a frame, but not during the entire charge collection time of a frame.

8. The imaging system according to claim 7, wherein the at least one programmable current source is configured to provide the neutralizing charge during at most two thirds of the charge collection time of a frame.

9. The imaging system according to claim 7, wherein the at least one programmable current source is configured to provide the neutralizing charge during at most one half of the charge collection time of a frame.

10. The imaging system according to claim 7, wherein the at least one programmable current source is configured to provide the neutralizing charge during at most one third of the charge collection time of a frame.

11. The imaging system according to any of claims 1 - 10, wherein the detector circuit does not comprise a feedback loop over an amplifier.

12. An imaging system in accordance with any of claims 1 -11, comprising plural detector circuits, each of the plural detector circuits comprising at least one capacitor and arranged to receive the neutralizing charge from the at least one programmable current source.

13. The imaging system according to any of claims 1 - 12, comprising circuitry configured to generate a biasing voltage across at least part of the detector substrate.

14. The imaging system according to any of claims 1 - 13, further comprising a processing core configured to program the at least one programmable current source.

15. The imaging system according to any of claims 1 - 14, wherein the at least one programmable current source is comprised inside the detector circuit.

16. The imaging system according to any of claims 1 - 15, wherein the imaging system further comprises memory configured to store information enabling the neutralizing charge to be defined for each pixel and frame number.

17. The imaging system according to any of claims 1 - 16, wherein the imaging system further comprises at least one temperature sensor configured to measure a temperature of the detector substrate.

18. A method in a detector circuit, comprising:

- collecting, in a capacitor coupled with a detector substrate of the detector circuit, an electrical charge from the detector substrate, and

- providing a neutralizing charge to the capacitor from at least one programmable current source, and selecting a value for the neutralizing charge in dependence of a frame number.

19. The method in accordance with claim 18, wherein the detector substrate comprises a semiconductor substrate such as: a CdTe substrate, a GaAs substrate, a Si substrate, a Hgl2 or a Se substrate.

20. The method according to any of claims 18 - 19, wherein the at least one programmable current source provides the neutralizing charge to the capacitor separately for each pixel or group of pixels.

21. The method according to any of claims 18 - 20, further comprising selecting a value for the neutralizing charge separately for each pixel, or separately for each group of pixels.

22. The method according to any of claims 18 - 21, further comprising generating a biasing voltage across at least part of the detector substrate.

23. The method according to any of claims 18 - 22, further comprising providing, by the at least one programmable current source, the neutralizing charge during a part of a charge collection time of a frame, but not during the entire charge collection time of a frame.

24. The method according to claim 23, wherein the at least one programmable current provides the neutralizing charge during at most two thirds of the charge collection time of a frame.

25. The method according to claim 23, wherein the at least one programmable current source provides the neutralizing charge during at most one half of the charge collection time of a frame.

26. The method according to claim 23, wherein the at least one programmable current source provides the neutralizing charge during at most one third of the charge collection time of a frame.

27. The method according to any of claims 18 - 26, wherein the detector circuit does not comprise a feedback loop over an amplifier.

28. The method according to any of claims 18 - 27, wherein the method comprises using plural detector circuits as part of an imaging system, the imaging system further comprising the detector substrate.

29. The method according to any of claims 18 - 28, further comprising programming the at least one programmable current source by a processing core.

30. The method according to any of claims 18 - 29, wherein the at least one programmable current source is comprised inside the detector circuit.

31. A non-transitory computer readable medium having stored thereon a set of computer readable instructions that, when executed by at least one processor, cause an imaging system to at least:

- collect, in a capacitor comprised in a detector circuit of the imaging system, an electrical charge from a detector substrate, and

- provide a neutralizing charge to the capacitor from at least one programmable current source, wherein a value for the neutralizing charge is selected in dependence of a frame number.

32. A computer program configured to cause a method in accordance with at least one of claims 18 - 30 to be performed.