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Design of Precision CMOS Bandgap Reference with an Over Temperature Protection Circuit

Pan Li

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Abstract

A precision CMOS Bandgap Reference with a soft start-up circuit is presented,the principle of the PN junction with a negative temperature coefficient when it is forward biased,and the reference current has a positive temperature coefficient have been utilized to realize the function of the Over Temperature Protection(OTP).By using 0.6μm 2P2M standard CMOS process of UMC,this reference was designed and simulated,HSPICE simulation results indicated that the output of the reference voltage is 1.293V and this bandgap reference has higher precision and stability.The maximal skew of reference voltage to input voltage is 0.27 mV in the power supply range from 1.5 V to 4 V,and to the temperature is about 4.41 mV at the range of-40 ℃～120 ℃.The start-up time of output is about 25 μs.When the temperature exceeds 160 ℃,an enable signal will be generated which shuts down the whole system.

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A precision CMOS Bandgap Reference with a soft start-up circuit is presented,the principle of the PN junction with a negative temperature coefficient when it is forward biased,and the reference current has a positive temperature coefficient have been utilized to realize the function of the Over Temperature Protection(OTP).By using 0.6μm 2P2M standard CMOS process of UMC,this reference was designed and simulated,HSPICE simulation results indicated that the output of the reference voltage is 1.293V and this bandgap reference has higher precision and stability.The maximal skew of reference voltage to input voltage is 0.27 mV in the power supply range from 1.5 V to 4 V,and to the temperature is about 4.41 mV at the range of-40 ℃～120 ℃.The start-up time of output is about 25 μs.When the temperature exceeds 160 ℃,an enable signal will be generated which shuts down the whole system.

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Available abstract

A precision CMOS Bandgap Reference with a soft start-up circuit is presented,the principle of the PN junction with a negative temperature coefficient when it is forward biased,and the reference current has a positive temperature coefficient have been utilized to realize the function of the Over Temperature Protection(OTP).By using 0.6μm 2P2M standard CMOS process of UMC,this reference was designed and simulated,HSPICE simulation results indicated that the output of the reference voltage is 1.293V and this bandgap reference has higher precision and stability.The maximal skew of reference voltage to input voltage is 0.27 mV in the power supply range from 1.5 V to 4 V,and to the temperature is about 4.41 mV at the range of-40 ℃～120 ℃.The start-up time of output is about 25 μs.When the temperature exceeds 160 ℃,an enable signal will be generated which shuts down the whole system.

Key concepts: Bandgap voltage reference, Voltage reference, Temperature coefficient, Silicon bandgap temperature sensor, CMOS, Skew, Voltage, Electrical engineering

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