Logarithmic Compensated Voltage Reference

Very important stages in applications such as AID and D/A converters, data acquisition systems, memories or smart sensors, voltage reference circuits 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.