Bandgap Voltage Reference - Simulations in Cadence and Layout Design
Rumiana Iliyanova Todorova, T. B. Takov, Atanas Stoyanov Pangev · 2009
Analog and digital circuit ultimately need a voltage reference. The reference establishes a state point used by other subcircuits to generate predicable results. This reference point should not fluctuate significantly under various operating conditions such as moving power supply voltage, temperature variation, and transient loading events. A example a circuit amplification where reference are intrinsically require are linear regulators. A bandgap reference circuit for 0.35 µm CMOS technology operates in an essentially temperature independent manner and having low supply voltages. In the conventional bandgap circuit, the output voltage VREF is the sum of built-in voltage of the diode VBE and thermal voltage VT. Therefore VREF is about 1.2 V that is passing to regulator, which limits a low supply by linear regulator operation below 3.2 V.