| 摘要 |
A CMOS precision current source which is insensitive to changes in both ambient temperature and processing conditions. In particular, a CMOS circuit exhibits both a temperature dependent voltage (V(T)) and a temperature dependent on-chip resistance (R(T)) where the dependencies of both voltage and resistance are linear functions of temperature of the form y=mx+b. The ratio of the slopes (mV/mR) is constructed to be equal to the ratio of the y-intercepts (bv/bR), where this ratio is a constant value, denoted s. Therefore, since a constant output current Io is equal to V(T)/R(T), Io will be equal to the constant value s. Additionally, a constant reference voltage (Vo) may also be provided with a minimal increase in the circuitry needed to provide the constant current.
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