Design of a Low Power Bandgap Reference with Curvature Compensation
A self-biased op-amp-free bandgap voltage reference circuit was designed in a 0.35 μm BCD technology to address the issues of input offset affecting voltage accuracy and poor power supply rejection in traditional references.It stabilized the output reference voltage through a negative feedback network,effectively eliminating the influence of the operational amplifier's input offset voltage.By combining negative feedback and common-source/common-gate current mirrors,it enhances the reference's immunity to interference,ensuring improved power supply rejection.The circuit utilized exponential curvature compensation for excellent temperature characteristics over a wide voltage range.Additionally,the self-biasing scheme minimized static current consumption.Simulation results demonstrate a 1.271 V output reference voltage at a 5 V supply,with a temperature coefficient of 5.46 × 10-6/℃ from-40 to 150 ℃,a-87 dB power supply rejection at DC,and a static current consumption of 2.3 μA.It is suitable for low power PM chips.
bandgap referenceop-amp-freeself-biasedexponential curvature-compensatednegative feedbacktemperature coefficientpower supply rejectionlow power consumption
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