Patent ID: 9681081
Date: 2017-06-13
CPC Classifications: H03F,H04N

Claim:
1. A transimpedance gain circuit for temporally differentiating photo-sensing systems in dynamic vision sensors, which employs at least one photodiode, wherein the transimpedance gain circuit comprises: at least two in-series transistors, each one of the at least two in-series transistors being connected in diode configuration and being positioned at an output of the at least one photodiode; and a current mirror configured to control polarity of a current generated by the at least one photodiode, wherein the current mirror comprises electric current copying and inversion means and electric current amplification means, and wherein the current mirror is positioned between the at least one photodiode and the at least two in-series transistors, wherein the at least two in-series transistors are configured to be fed by an output current of the current mirror, which is a copy of the current generated by the at least one photodiode, such that the output current of the current mirror flows through drain-source channels of the at least two in-series transistors, and wherein the last in-series transistor of the at least two in-series transistors has a source connected to a voltage selected between a ground voltage, a constant voltage and a controlled voltage.