| 摘要 |
A multiplexer cell particularly adapted for multiplexing the output signals of photovoltaic detectors and which when appropriately connected together form a random access multiplexer for the photovoltaic detectors located in a large focal plane of a photosensing device. Each multiplexer cell includes an input circuit to which the input signal current from a detector is applied. A charge is stored in a storage well, the magnitude of which is an integration over an integration period of the input signal from a detector. The output of the input circuit is an output voltage produced by a sensor in close proximity to the storage well. The output voltage is a function of the magnitude of the charge stored during each integration period. Each multiplexer cell also includes a random access multiplexer output circuit to which the output voltage signal produced by its associated input circuit is applied. When two concurrently applied enabling signals are applied to the "X" and "Y" control gates of the output circuit a current flows from the source of the output circuit to its output node. The output node is charged to a potential equal to that of the control gate to which the output voltage of the input circuit is applied. A low impedance source of electric energy is connected to the source of the output node so that capacitance of the output nodes of a large number of such cells when connected together does not reduce the magnitude voltage of the output signal of the multiplexer.
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