Design of PID Coprocessing Module for CPT Atomic Clock Control SoC

[摘要] The CPT (Coherent Population Trapping) atomic clock is very small because there is no microwave cavity. However, the circuit control system is becoming the constraint of further miniaturization of CPT atomic clock. The CPT atomic clock control SoC integrates control related circuit into a single chip. There are many control loops in the CPT atomic clock which require PID (Proportional-Integral-Derivative) algorithm. CPU in this SoC can not afford the computation of PID algorithm. So a PID coprocessing module is integrated into this SoC. The PID algorithm can be decomposed into multiply-add operations. The coprocessing module mainly consists of a multiply-add module. Compared with SoC without PID coprocessing module, SoC with this module can reduce the time of calculating PID algorithm to 24.808%, and the area consumption increases by only 8.89%.

[发布机构] Sichuan Institute of Solid-State Circuits, China Electronics Technology Group Corp, Chongqing; 400060, China^1

[效力级别] 无线电电子学 [学科分类] 计算机科学（综合）

[关键词] Circuit control;Coherent population trapping;Control loop;CPT atomic clocks;Microwave cavity;PID (proportionalintegral-derivative);PID Algorithm;Single chips