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Dong-Sun MIN Sooin CHO Dong Soo JUN Dong-Jae LEE Yongsik SEOK Daeje CHIN
This paper presents novel temperature-compensation circuit techniques for the CMOS DRAM internal voltage converter, the RC-delay circuit, and the back-bias generator, which do not need any additional process steps. The abovementioned circuits have been designed and evaluated through a 16-Mb CMOS DRAM. These circuits have shown an internal voltage converter (IVC) with an internal voltage temperature coefficient of 185 ppm/, and an RC-delay circuit with a delay time temperature coefficient of 0.03%/. As a result, 6.5-ns faster RAS access time and improved latch-up immunity have been achieved, compared with conventional circuit techniques.