High Resolution Imaging System
a high-resolution, imaging system technology, applied in the field of radiographic imaging, can solve the problem of not using a scanning system coupled to the disclosed position sensitive digital detection method
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first embodiment
[0110]The first embodiment is to use a passive resistance in the feedback circuit. This is limited on how much resistance can be built into the chip at the feedback loop of the input amplifier at the input of each channel.
second embodiment
[0111]The second embodiment is to use resistive multiplier feedback circuit, which is an innovative way to create a linear element (a resistor) with active MOSFET components. This circuit uses current mirror divider circuits configured as an extremely small transconductance amplifier to make an equivalent resistor greater than 200 MOhm (2×10+8 Ohms). A small 100 KOhm resistor is used as the reference device for this circuit. A measurement of current going through the 100 KOhm resistor is made and a new current level of 1 / 200th the magnitude is driven at the output pin. The resistive multiplier circuit achieves high resistances in a small area because it replaces the large area required for a large linear resistor (>108 Ohms) with a circuit of area 0.042 mm2. A resistor of 200 MOhm made from 1 kOhm / square (Ohms cm length / width thickness) polysilicon would be 1 mm2 in size for a 0.5 μm process. Also, a large resistor element would suffer from RC delay effects, which the active circuit...
third embodiment
[0112]The third embodiment is to use a MOSFET transistor as a resistive feedback circuit with its resistance is externally controlled. Such circuitry can be used to produce a large resistance feedback component, >109 Ohms. It has a much smaller area, about 0.001 mm2. Therefore, it is especially appropriate to use for smaller pixel sizes such as 250×250 μm2 pixel pitch. It can be added as an option to the resistive multiplier circuit during the prototype fabrication so that it can be tested and evaluated in comparison to the resistive multiplier circuit. Unfortunately, MOSFET resistive element is nonlinear and also it may not be used with the pole-zero cancellation circuit.
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