Design and Simulation of a Temperature-Independent Bandgap Reference Circuit Using LTspice

Nikhat Fatima1, Prof .Sadhana C 2, Dr.Basavalinga Swamy 3 , Dr.Sharanbasappa Shetkar 4 ,

Dr.Vinita Patil 5

1Nikhat Fatima Dept of VLSI Design and Embedded system, M.Tech student, LAEC, Bidar

2Prof .Sadhana C, Assistant Professor, Department of ECE, LAEC Bidar 3Dr.Basavalinga Swamy, Associate Professor, Department of ECE,LAEC Bidar 4Dr.Sharanbasappa Shetkar, Professor, Department of ECE, LAEC Bidar 5Dr.Vinita Patil, Professor, Department of ECE, LAEC Bidar

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Abstract - A bandgap reference circuit is an essential analog building block used to generate a stable reference voltage that remains nearly constant despite changes in temperature and supply voltage. Such reference circuits are widely employed in voltage regulators, analog-to-digital converters, battery management systems, and mixed-signal integrated circuits. This work presents the design and simulation of a temperature-compensated bandgap reference circuit using LTspice. The proposed circuit combines the complementary temperature characteristics of bipolar junction transistors to produce a nearly constant output reference voltage. Standard discrete transistor models (2N3904 and 2N3906) along with passive resistors are utilized to implement the design. Temperature analysis is carried out over a range from −40°C to 125°C to evaluate circuit stability. Simulation results demonstrate that the reference voltage exhibits minimal variation throughout the tested temperature range, confirming the effectiveness of the compensation technique. The proposed design provides a simple, low-cost, and educational implementation suitable for learning analog integrated circuit concepts.

KeyWords: Bandgap Reference, LTspice, Analog Circuit, Temperature Compensation, Reference Voltage, Bipolar Junction Transistor.