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温度系数连续可调的带隙基准源电路设计

Design of bandgap reference circuit with continuously adjustable temperature coefficient

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摘要

为了对薄膜晶体管液晶显示器(TFT-LCD)驱动芯片的驱动电压进行温度补偿以改善TFT-LCD的性能,本文基于标准CMOS(3.3 V)的chrt35rf 0.35 μm工艺,设计了一款温度系数可连续调节的带隙基准电压源,其中包括核心电路、运算放大器电路和启动电路3个子模块。该电路使用MOS晶体管作为可变电阻,通过调节MOS栅极电压控制MOS漏源等效电阻的连续可变,进而改变电路中的电阻比值,实现带隙基准源的温度系数连续可调。使用Cadence的Spectre仿真器进行仿真,结果表明,在-25~125 ℃的工作温度范围内,带隙基准源电路的输出电压的正温度系数可连续调节范围为156.6~2 545.0 ppm/℃,输出电压的负温度系数的连续变化范围为156.6~1 337.7 ppm/℃,输出基准电压变化为0.95~2.67 V,低频时基准电压的电源抑制比达到73.13 dB。该电路实现了基准电压从负温度系数向正温度系数的连续可调节,且调节范围较大。

Abstract

In order to compensate the driving voltage of driver chip of thin-film-transistor liquid crystal display(TFT-LCD) to improve the performance of TFT-LCD, in this paper, based on the standard CMOS (3.3 V) chrt35rf 0.35 m process, a bandgap reference circuit with continuously adjustable temperature coefficient is designed. The circuit includes three sub-modules of a core circuit, an operational amplifier circuit, and a startup circuit. Using a MOS transistor as a variable resistor, the source-drain equivalent resistance of MOS can be changed continuously by the gate voltage. Then, the temperature coefficient of the bandgap reference can be adjusted continuously by changing the resistance ratio in the circuit. The designed circuit is simulated by the Cadence Specter simulator. The results show that in the working temperature range from -25 to 125 °C, the positive temperature coefficient, negative temperature coefficient, and output voltage are 156.6~2 545.0 ppm/°C, 156.6~1 337.7 ppm/°C, and 0.95~2.67V, respectively. The power supply rejection ratio(PSRR) of the reference voltage at low frequencies reaches 73.13 dB. The circuit achieves continuous adjustment of the reference voltage from negative temperature coefficient to positive temperature coefficient. In addition, the adjustment range of temperature coefficient is large.

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中图分类号:TN433

DOI:10.3788/yjyxs20183305.0412

所属栏目:图像处理

收稿日期:2017-12-05

修改稿日期:2018-03-09

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作者单位    点击查看

庄楚楠:广东工业大学 材料与能源学院,广东 广州 510006
许佳雄:广东工业大学 材料与能源学院,广东 广州 510006

联系人作者:庄楚楠(zcn574918628@126.com)

备注:庄楚楠(1995-),男,广东湛江人,硕士研究生,主要从事模拟集成电路设计和半导体光电器件方面的研究。

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引用该论文

ZHUANG Chu-nan,XU Jia-xiong. Design of bandgap reference circuit with continuously adjustable temperature coefficient[J]. Chinese Journal of Liquid Crystals and Displays, 2018, 33(5): 412-417

庄楚楠,许佳雄. 温度系数连续可调的带隙基准源电路设计[J]. 液晶与显示, 2018, 33(5): 412-417

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