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A sub 1 v high PSRR CMOS bandgap voltage reference

Chahardori, M ; Sharif University of Technology | 2011

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  1. Type of Document: Article
  2. DOI: 10.1016/j.mejo.2011.06.010
  3. Publisher: 2011
  4. Abstract:
  5. A Bandgap circuit capable of generating a reference voltage of less than 1 V with high PSRR and low temperature sensitivity is proposed. High PSRR achieved by means of an improved current mode regulator which isolates the bandgap voltage from the variations and the noise of the power supply. A vigorous analytical approach is presented to provide a universal design guideline. The analysis unveils the sensitivity of the circuit characteristic to device parameters. The proposed circuit is fabricated in a 0.18μm CMOS technology and operates down to a supply voltage of 1.2 V. The circuit yields 20 ppm/°C of temperature coefficient in typical case and 50 ppm/°C of temperature coefficient in worst case over temperature range -40 to 140°C, 60 ppm/V of supply voltage dependence and 60 dB PSRR at 1 MHz without trimming or extra circuits for the curvature compensation. The entire circuit occupies 0.027 mm2 of die area and consumes 134μW from a 1.2 V supply voltage at room temperature. Twenty chips are tested to show the robustness of the topology and the measurement results are compared with Monte Carlo simulation and analysis
  6. Keywords:
  7. Analog integrated circuits ; CMOS bandgap voltage reference ; Low voltage ; Analog integrated circuit ; Analytical approach ; Bandgap circuits ; Bandgap voltage ; Circuit yield ; CMOS bandgap voltage reference ; CMOS technology ; Current mode ; Curvature compensation ; Device parameters ; Die area ; High PSRR ; Low temperature sensitivity ; Low voltages ; Measurement results ; Monte Carlo Simulation ; Power supply ; Reference voltages ; Room temperature ; Supply voltages ; Temperature coefficient ; Temperature range ; Universal Design ; Worst case ; CMOS integrated circuits ; Computer simulation ; Design ; Energy gap ; Linear integrated circuits ; Monte Carlo methods ; Voltage measurement ; Analog circuits
  8. Source: Microelectronics Journal ; Volume 42, Issue 9 , 2011 , Pages 1057-1065 ; 00262692 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S0026269211001297