Reference voltage circuit

Abstract

This invention relates to one voltage reference circuit, which comprises positive temperature parameter current generator, negative temperature current generator and first resistance, wherein, the positive parameter current generator has two transistor operations areas and the second resistance is connected between two transistor tubes; the second resistance uses operation in weak reverse areas transistor with similar double electrode transistor property to generate positive temperature parameter current; negative temperature parameters current generator is on third one through the negative one to generate negative temperature parameter current.

Description

technical field [0001] The present invention relates to a voltage reference circuit, and in particular to a voltage reference circuit of a CMOS transistor. Background technique [0002] FIG. 1 is a graph of parameters related to semiconductor process technology. As the channel length of MOS (metal-oxide-silicon) transistors shrinks, the critical voltage V of MOS transistors TH and did not increase with the operating voltage V DD proportional decrease. Therefore, under the condition of limited voltage headroom, all analog circuits are faced with how to operate at a low operating voltage V DD However, the original performance of the circuit is still maintained. [0003] Figure 2 is a circuit diagram of a traditional voltage reference circuit, which uses PMOS transistors MP21 and MP22 biased in the subthreshold region, successfully exchanging a larger voltage headroom, allowing the circuit to work at a low operating voltage V DD Down. The traditional voltage reference cir...

AI Technical Summary

Problems solved by technology

The positive temperature coefficient current generator is used to generate the positive temperature coefficient current

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