PMB (Process Monitoring Box) Sensor Development And Verification

Abstract

PM CONTROL is a sensor to be used for process monitoring, on chip compen- sation to save power. It measures the performance of the chip in terms of leakage power and speed. The process monitoring can be used at EWS (wafer level test) to check that the chip remains within predefined process limits or at application level during product lifetime for temperature monitoring, compensation, debug and fail- ure analysis. Each process option is measured with a dedicated sensor including two oscillators. One oscillator measures the speed of NMOS and PMOS separately and other measures the leakage.PM CONTROL supports two types of sensors, NON- CPR and CPR sensors. CPR sensor which is used for critical path's transistors per- formance measurement and RC interconnect effect measurement. Unlike the PMB NON-CPR sensors, has two rings implemented as a hard macro and soft macro. PMB sensor integrated inside chip. Sensor integrated on chip which is connected to PMB wrapper.PMB wrapper is interfaced with PMB controller. So, PMB sensor in- tegrated on chip accessed through PMB controller.PMB controller can be operated in three different mode JTAG mode, APB interface and parallel mode. As circuit becomes larger and more complex and the technology moves to lower nodes, manual creation of the digital modules of these design become more difficult. To simplify and speed up the design process, synthesis and place-and-route tools are used to automate much of the design of the digital domain. To support this requirement my work also moves around development of such standard cell libraries. The internship mainly involved backend verification of PMB sensors and mak- ing layouts of Standard cell libraries from given schematics and packaging PMB libraries. In the ow, firstly the schematics are made. Then layouts are made from the schematics. I am responsible for DRC, LVS , DFM and LFD issues regarding these layouts. Then CDL and GDS _les extracted from the schematic and layout. Apart from this, i am responsible for cad data generation using eldo simulator and have to check voltage sensitivity, rc impact and temperature sensitivity of PMB sensor.