A system architecture for automated charge modification of analog memories

This paper describes a system architecture for automated charge modification of analog memories. The proposed circuit uses a constant charge injection scheme along with a negative feedback loop to allow automated on-chip programming of floating-gate transistors to a desired target value. In addition, array programming of analog memories is enabled with a parameter independent target voltage generator circuit. Feasibility of the proposed approach is demonstrated with experimental results from a 0.5µm CMOS process prototype IC. Results for onchip programming of a single device and automated programming of an array of memories are presented.