Research And Implementation Of Low-power Standard Cell Library For Implantable Medical CPU

With the continuous advancement of medical standards,the continuous development of integrated circuit technology,and the continuous maturity of wireless communication technology,implantable medical chips have gradually changed the traditional medical model.Under the application background of the implantable medical central processing unit(Central Processing Unit,CPU),limited by the capacity and life of the battery,there are strict requirements on the power consumption of the CPU.Therefore,a low-power CPU is of great significance to implantable medical systems.However,to realize a low-power CPU suitable for implantable medical treatment,a low-power processor architecture must be selected first,and more importantly,to implement the circuit based on a low-power standard cell library.This paper designs a low-power digital standard cell library for implantable medical CPUs,and selects a low-power open-source RISC-V(Reduced Instruction Set Computer V)architecture CPU as the carrier,and completes the implantation Research and design of low-power digital standard cell library based on medical CPU.The main content of this article is as follows:First,by comparing the CPU parameters of the open-source RISC-V architecture,a low-power CPU core suitable for implantable medical treatment was selected.Then,the design goals were clarified by analyzing the source of power consumption of the circuit,and the design optimization was carried out from the cell size and structure of the standard cell.For HHGrace110nm process node,0.65V voltage,-40 to 85 degrees Temperature range,and can withstand the impact of 10%VDD fluctuations at the voltage angle.Through the development of standard cell schemes,circuit and layout design,timing library establishment,physical library establishment and other library building procedures,the low-power standard cell library design has been completed.Then after the design of the low-power standard cell library is completed,the low-power standard cell library is verified at the device,unit,and circuit level.At the circuit level,a 4-bit counter and a 32-bit ALU are designed and implemented using a digital circuit design process to verify the compatibility of the low-power standard cell library with EDA tools.At the same time,it is compared with the implementation of re-characterized commercial standard cells.For the counter and ALU,the power consumption of the counter circuit realized by the low-power cell library designed this time is reduced by 37%,and the power consumption of the ALU of the low-power cell library designed this time is reduced by about 30%.Finally,the designed standard cell library is applied to the design of low-power CPU,and the overall layout design is completed.The core layout area is 1.288mm~2,and the final tape-out layout is given,plus the overall chip after IO?PAD The layout area is 2.08mm~2.Compared with the implanted medical CPU realized by the re-characterized commercial standard cell library,the power consumption of the implanted medical CPU with the low power cell library designed this time is reduced by 15%.