A matrix-array detector includes an array of pixels that are sensitive to a physical effect and arranged in a matrix along rows and down columns, each pixel generating a signal according to the physical effect; row conductors, each allowing the pixels of one row to be driven; driver modules delivering selection signals to the row conductors, the driver modules being configured to deliver signals according to either of two levels, one being a high level allowing one of the rows of pixels to be selected and the other being a low level not allowing it to be selected. The detector further comprises impedance modules that are connected to each of the row conductors and configured to decrease the impedance of each row conductor and to keep the impedance of each row conductor low in a phase of reading the array of pixels as long as the corresponding selection signal is at the low level, the impedance modules being separate from the driver modules.