Logarithmic Compensated Voltage Reference

Very important stages in applications such as A/D and D/A converters, data acquisition systems, memories or smart sensors, voltage reference circuits [1]-[3] and theirs temperature behavior are intensively studied in the last decade and many researches have been developed for improving them. The new proposed realization of a CMOS voltage reference uses a gate-source voltage of a MOS transistor working in weak inversion as CTAT voltage generator. The idea is that the negative linear dependent term from V(GS)(T) expression to be compensated by a complementary term implemented using an OVF (Offset Voltage Follower) block. The new curvature-correction technique proposes the compensation of the nonlinear temperature dependence of the gate-source voltage using an original block, ADA (Asymmetric Differential Amplifier), biased at drain currents with different temperature dependencies.