GAIN-RANGING CHARGE AMPLIFIER

摘要

The system may include a pixel array, a selector, a sampler, and a converter. The pixel array may generate output signals that representing radiation incident upon the pixel array. The selector may select one of the output signals. The sampler may sample the selected output signal. The converter may generate a digital signal based upon the selected output signal. The sampler may include a charge integrator that compensates for parasitic capacitance of the selector by selecting a first feedback capacitance to obtain a first sample, and after obtaining the first sample, selecting a second feedback capacitance to obtain a second sample. The first feedback capacitance may be greater than the second feedback capacitance.

主权项

1. A system, comprising:
a pixel array generating a plurality of output signals that representing radiation incident upon the pixel array; a selector selecting one of the plurality of the output signals; and a sampler sampling the one of the plurality of the output signals, wherein the sampler comprises a charge integrator that compensates for parasitic capacitance of the selector by selecting a first feedback capacitance of the charge integrator to obtain a first sample of the one of the plurality of the output signals, and after obtaining the first sample, selecting a second feedback capacitance of the charge integrator to obtain a second sample of the one of the plurality of the output signals, and wherein the first feedback capacitance is greater than the second feedback capacitance.