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 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 respectively representing radiation incident upon and stored as respective pixel charges of individual pixels in the pixel array; a selector selecting an output signal of the plurality of the output signals; and a sampler comprising a charge integrator that generates a voltage based on the pixel charge stored onto the selected pixel of the pixel array and based on a feedback capacitance of the charge integrator, wherein the charge integrator obtains a pixel charge of the selected output signal of a particular pixel onto a first feedback capacitance to produce a first sample at an output of the charge integrator, and then redistributes that pixel charge from the first feedback capacitance to a smaller second feedback capacitance to produce a second sample at the output of the charge integrator.