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Performance of a Diode-Based Bandgap Reference Circuit
Keywords: bandgap, voltage reference, low power
A low-power, reliable, on-chip voltage reference is very advantageous when implementing systems on a chip. The performance of todays complex mixed-signal systems is directly dependent on the accuracy of highly-stable voltage references connected to ADCs, DACs, amplifiers, and oscillators. Multiple instantiations of such circuits can allow chip subsystems to operate independently, providing a level of resiliency and system redundancy. A voltage reference circuit based on a two-diode bandgap design and implemented in SOI is presented. This circuit functions at high temperatures, has an ultra-low power requirement, and is relatively simple to implement in system designs. The PTAT design is shown to have very good accuracy and stability from -40C to 200C. A simpler design using diodes rather than more complex components is described that provides adequate performance, ease of simulation, and faster design cycles. The design and implementation of the circuit are discussed, as well as performance considerations.
Paul W. Moody, IC Design Lead
Provo, UT

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