High Temperature Bipolar Master-Slave Comparator and Frequency Divider in 4H-SiC Technology

• This paper demonstrates a fully integrated master-slave emitter-coupled logic (ECL)comparator and a frequency divider implemented in 4H-SiC bipolar technology. The comparator consists of two latch stages, two level shifters and an output buffer stage. The circuits have been tested up to 500 °C. The single ended output swing of the comparator is -7.73 V at 25 °C and-7.63 V at 500 °C with a -15 V supply voltage. The comparator consumes 585 mW at 25 °C. The frequency divider consisting of two latches shows a relatively constant output voltage swing over the wide temperature range. The output voltage swing is 7.62 V at 25 °C and 7.32 V at 500 °C.

Nyckelord

Silicon carbide (SiC)

bipolar junction transistor (BJT)

high temperature integrated circuit (IC)

master-slave latched comparator

frequency divider

bipolar comparators

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