A detailed frequency analysis of Power Supply Rejection (PSR) in Brokaw bandgap voltage
reference is carried out. The knowledge of the frequency behavior in a voltage reference
becomes mandatory to the designer especially in RF or digital environment where disturbs
coming from supply lines becomes more evident. Precise and simple models, useful for
pencil and paper analysis, are developed and a compensation technique for improving the
circuit frequency performance is also discussed. Results are validated by comparing the …

Since its introduction, the Brokaw bandgap reference [11 (or an equivalent version [? I]) has
been widely used in a wide range of applications such as A/D and D/A converters, voltage
regulators, measurements, instrumentation circuits, etc. The bandgap reference generates a
dc voltage that is ideally temperature independent. This is achieved by adding a voltage,
which is proportional to the absolute temperature (PTAT), to a baseemitter voltage in order to
compensate for its first-order temperature dependency [2-31. In the literature, performance of …