A Fully Integrated Architecture for Fast Programming of Floating Gates

We present an on-chip system that enables programming floating gate arrays at a high speed. The main component allowing this speedup is a floating point current measuring ADC operating over 4 decades at 10bit accuracy or 7decades at 7 bit accuracy. The conversion time is around 200
μ
s till around 30 pA of current. The gate and drain voltages are set by on-chip DACs. The digital words for the DAC are sent by an FPGA through an SPI interface. The controller for sequencing the operations as well as the look-up-table with characterization data are on the FPGA. Algorithms using either pulse-width modulation or drain voltage modulation can be implemented.