Resumen
The present invention relates to a new robust linear variable gain photometric circuit based on retroactive compensations both positive and negative. Here, the transimpedance amplifier used to convert the photocurrent to voltage is compensated with positive feedback, in order to make the multilayer circuit to strengthen the photocurrent, compensating the current variations that pass through the photodiode while keeping the voltage drop between zero your terminals. The new photometric device is robust against variations and uncertainties in the parameters of the photodiodes and against variations in environmental conditions, such as temperature variations during the measurement process, considerably reducing the deviation of the output signal from the true value of measurement against parametric uncertainties and undesired effects due to unmodeled dynamics that manifest as measurement noise. (Machine-translation by Google Translate, not legally binding)