Abstract
A design method of BJTs for high-precision temperature-sensing is studied. The effects of non-idealities in the BJT on temperature-sensing accuracy are analyzed, and an accuracy evaluation formula containing the non-idealities is derived. We have proposed a novel parameter criteria of high-precision temperature-sensing BJT which constrains the influenced error of each non-ideality below ±0.1 °C using the variable-controlling procedure. The conversion approach from the proposed parameter criteria to electrical characteristics is also developed to guide the high-precision temperature-sensing BJT design. According to the proposed method, temperature-sensing BJTs are designed and fabricated. The test results showed that the temperature-sensing accuracy is within ±0.5 °C in temperature range of −55 °C to 125 °C, which meets the need for high-precision temperature sensing.
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