An antijamming holding circuit is proposed to solve the problem with data losing under the noise in the SRAM-based FPGA configuration cell.When the structure parameters of the area efficient configuration cell designed

the Static Noise Margin(SNM) of configuration cell increases as the power supply voltage increases.Through the detailed design of the voltage reference

charge pump and voltage comparation circuit

we realized a feedback controlled steady power supply for FPGA configuration cell.Simulation and testing results show

an FPGA with the new structure can hold data in configuration cell under the 1.8V voltage while its normal voltage supply is 2.5V

which improve the antijamming performance of FPGA.