0.91 V reference, 3.3 ppm/°C Sub-BGR with second-order compensation and improved PSRR

Area of Science:

• Electrical Engineering
• Analog Integrated Circuit Design

Background:

• Bandgap Reference (BGR) circuits are fundamental for stable voltage generation.
• Conventional BGR designs face challenges with temperature stability and process variations.
• High-precision applications demand improved performance metrics like temperature coefficient and PSRR.

Purpose of the Study:

• To design and analyze a novel Bandgap Reference (BGR) circuit.
• To enhance temperature stability and minimize process variation effects.
• To achieve superior performance compared to existing BGR topologies.

Main Methods:

• Implementation of a second-order compensation technique.
• Design of an optimized error amplifier and a low-temperature-coefficient resistor network.
• Development of a robust startup mechanism for stable circuit operation under PVT variations.
• Simulation and comparison with conventional CM-BGR, Cascaded CM-BGR, Op-Amp based-BGR, and Sub-BGR.

Main Results:

• Achieved a temperature coefficient of 3.33 ppm/°C (58.97-78.79% reduction).
• Demonstrated 1.12×-6.02× improvement in Power Supply Rejection Ratio (PSRR).
• Showcased 96% improved line regulation with 723 µV variation.
• Validated superior performance over Op-Amp based-BGR and Sub-BGR techniques.

Conclusions:

• The proposed BGR circuit offers significant improvements in temperature stability and process variation tolerance.
• The enhanced performance makes the BGR highly suitable for high-precision analog and mixed-signal applications.
• The design, simulated using 32nm CMOS technology, represents a notable advancement in BGR circuit design.