A 5-GHz CMOS programmable frequency divider whose modulus can be varied from 2403 to 2480 for 2.4-GHz ZigBee applications is presented. The divider based on a dual-modulus prescaler (DMP) and pulse-swallow counter is designed to reduce power consumption and chip area. Implemented in the 0.18-m mixed-signal CMOS process, the divider operates over a wide range of 1-7.4 GHz with an input signal of 7.5 dBm; the programmable divider output phase noise is -125.3 dBc/Hz at an offset of 100 kHz. The core circuit without test buffer consumes 4.3 mA current from a 1.8 V power supply and occupies a chip area of approximately 0.015 mm 2 . The experimental results indicate that the programmable divider works well for its application in frequency synthesizers.

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Unemployment is a necessary part of social problems. COVID-19 drives unemployment rates around the world to levels unseen in a generation. In this research paper, a secondary statistical analysis of the correlation between the unemployment rate and mortality is made on the data from the National Bureau of Statistics and Local Bureau Of Statistics. (from 2009 to 2019). We collect the unemployment rate and mortality rate for each province in China from 2009 to 2019, along with the data related to GDP. The results show that there is a positive linear correlation between the unemployment rate and the mortality rate in the overall scope.