A Control System for Atomic Fountain Clock Based on Field- Programmable Gate Array

A control hardware for atomic fountain clock based on a field programmable gate array(FPGA) is presented, which can output 20 digital transistor-to-transistor logic(TTL) signals with resolution of 40 ns, 10 arbitrary waveforms and acquire 8 analog signals. Both outputs share same reference clock and trigger signal which ensures that all output signals are output in a synchronized well controlled way with a maximum timing error 500 ns. Moreover, The data acquisition and clock servo function is also integrated on FPGA. FPGA communicates with a PC by Ethernet. All the data are saved at the PC.