An accurate, trimless, high PSRR, low-voltage, CMOS bandgap reference IC

Lateral PNP;Trimming;System-on-Chip;SoC;Regulated reference;PSRR;Output impedance;Accuracy;Trimless;Bandgap references;Low-voltage;CMOS;Analog circuit design

Gupta, Vishal ; Electrical and Computer Engineering

University:Georgia Institute of Technology

Department:Electrical and Computer Engineering

关键词: Lateral PNP;    Trimming;    System-on-Chip;    SoC;    Regulated reference;    PSRR;    Output impedance;    Accuracy;    Trimless;    Bandgap references;    Low-voltage;    CMOS;    Analog circuit design;   

Others  :  https://smartech.gatech.edu/bitstream/1853/16174/1/gupta_vishal_200708_phd.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

Bandgap reference circuits are used in a host of analog, digital, and mixed-signal systems to establish an accurate voltage standard for the entire IC. The accuracy of the bandgap reference voltage under steady-state (dc) and transient (ac) conditions is critical to obtain high system performance. In this work, the impact of process, power-supply, load, and temperature variations and package stresses on the dc and ac accuracy of bandgap reference circuits has been analyzed. Based on this analysis, the a bandgap reference that1. has high dc accuracy despite process and temperature variations and package stresses, without resorting to expensive trimming or noisy switching schemes, 2. has high dc and ac accuracy despite power-supply variations, without using large off-chip capacitors that increase bill-of-material costs,3. has high dc and ac accuracy despite load variations, without resorting to error-inducing buffers,4. is capable of producing a sub-bandgap reference voltage with a low power-supply, to enable it to operate in modern, battery-operated portable applications,5. utilizes a standard CMOS process, to lower manufacturing costs, and6. is integrated, to consume less board spacehas been proposed. The functionality of critical components of the system has been verified through prototypes after which the performance of the complete system has been evaluated by integrating all the individual components on an IC.The proposed CMOS bandgap reference can withstand 5mA of load variations while generating a reference voltage of 890mV that is accurate with respect to temperature to the first order. It exhibits a trimless, dc 3-sigma accuracy performance of 0.84% over a temperature range of -40°C to 125°C and has a worst case ac power-supply ripple rejection (PSRR) performance of30dB up to 50MHz using 60pF of on-chip capacitance. All the proposed techniques lead to the development of a CMOS bandgap reference that meets the low-cost, high-accuracy demands of state-of-the-art System-on-Chip environments.