One-stage preamplifier with intrinsic pulse shaping
A direct-conversion counting x-ray detector includes an analog front end. The analog front end is one-stage. The one stage includes a preamplifier and a pulse shaping unit.
1. A direct-conversion counting x-ray detector comprising:
an analog front end that includes one single stage that performs both preamplification and pulse shaping via a single preamplifier and a pulse shaping unit, the pulse shaping unit including a path having a switch and the switch is configured to activate or deactivate the path to switch between unipolar and bipolar shaping.
2. The x-ray detector of claim 1 , wherein the one stage includes a feedback path.
3. The x-ray detector of claim 2 , wherein the feedback path includes a first impedance Z Feedback and wherein an amplification of an input signal and a pulse shaping is dependent on the first impedance Z Feedback .
4. The x-ray detector of claim 2 , wherein the one single stage includes a capacitor with a parallel-connected resistor.
5. The x-ray detector of claim 4 , wherein the parallel-connected resistor is low-resistance.
6. The x-ray detector of claim 2 , wherein the path is between the first impedance Z Feedback and a ground or a supply voltage, and wherein the path includes a second impedance Z Bipolar between the first impedance and the ground or the supply voltage.
7. The x-ray detector of claim 1 , wherein in the activated state of the path the one single stage includes a bipolar pulse shaping unit.
8. The x-ray detector of claim 1 , wherein in the deactivated state of the path, the one single stage includes a unipolar pulse shaping unit.
9. The x-ray detector of claim 3 , wherein the first impedance Z Feedback is adjustable.
10. A medical device comprising:
the x-ray detector of claim 1 .
11. The medical device of claim 10 , wherein the medical device is a computed tomography system.
12. The x-ray detector of claim 3 , wherein the one single stage includes a capacitor with a parallel-connected resistor.
13. The x-ray detector of claim 12 , wherein the parallel-connected resistor is low-resistance.
14. The x-ray detector of claim 3 , wherein the one single stage includes a path between the first impedance Z Feedback and a ground or a supply voltage, and wherein the path includes a second impedance Z Bipolar between the first impedance and the ground or the supply voltage.
15. The x-ray detector of claim 6 , wherein the first impedance Z Feedback or the second impedance Z Bipolar is adjustable.
16. A medical device comprising:
the x-ray detector of claim 2 .
17. The medical device of claim 16 , wherein the medical device is a computed tomography system.
18. A medical device comprising:
the x-ray detector of claim 3 .
19. The medical device of claim 18 , wherein the medical device is a computed tomography system.
20. A medical device comprising:
the x-ray detector of claim 6 .
21. The medical device of claim 20 , wherein the medical device is a computed tomography system.