Design of a Precision Voltage Source Based on Concise Resistor Network
Jiang Yanfeng · 2012
With the advancement of fabrication process and the increasing complexity of IC's,more accurate voltage reference source with diversified regulating value and smaller layout area is required for system-on-chip.An adjustable voltage reference source based on 1.5 μm 36 V bipolar process was proposed,with process induced error taken into consideration.The voltage source was improved based on traditional bandgap reference circuit using two bipolar junction transistors.In the new circuit,a new adjustable resistor network was used to save layout area and reduce power consumption.Simulation results showed that the bandgap voltage source could guarantee a voltage accuracy of 0.8% and a temperature coefficient of 1.8×10-5/℃.In addition,the voltage values could be adjusted from 1.205 V to VCC as required.