Double-negative feedback loop four-quadrant V/I source measurement unit board card based on CPCI bus

The invention provides a double-negative feedback loop four-quadrant volt-ampere source measurement unit board card based on a CPCI bus. The board card comprises a CPCI bus module, an FPGA module, anADC module, a DAC module, a relay control module, a power supply module and a double negative feedback loop module. The CPCI bus module is a board card system bus to connect an upper computer with theFPGA module and is used for the upper computer to perform control and data exchange. The FPGA module comprises a CPCI bus bridge chip IP core, an ADC module control IP core and a DAC module control IP core. The relay control module is used for switching the functions of a voltage increasing and measuring circuit and a current increasing and pressure measuring circuit of the double-negative feedback loop, and the double-negative feedback loop module comprises a voltage source and current measuring negative feedback loop and a current source and voltage measuring negative feedback loop. The board card provided by the te