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描述了应用于电流模逻辑电路中的高线性度电压电流转换电路的设计与实现.该电路采用高增益两级运算放大器构成负反馈,偏置电路利用工作在弱反型区的MOS管电压电流呈指数律关系构成PTAT(proportional to absolute temperature)基准电流源.详细分析了电阻的类型以及运算放大器的参数对线性度的影响.通过优化运算放大器的参数并采用电压系数较小的多晶硅电阻作为线性器件获得了较高的线性度.本电路已采用CSMC0.6μm CMOS工艺实现,测试结果表明:输出的总谐波失真为0.000 2%.输入动态范围为0 ～2.6V,输出电流为50 ～426μA.PTAT基准电流源对电源变化的灵敏度为0.021 7.芯片采用5V供电,功耗约为1.3mW,芯片面积为0.112mm2.
The design and implementation of a high linearity voltage-to-current conversion circuit used in a current-mode logic circuit is described.The circuit uses a high-gain, two-stage operational amplifier to form a negative feedback circuit. The bias circuit utilizes the MOS tube voltage current The exponential relationship forms the reference current source of PTAT (proportional to absolute temperature). The influence of the type of resistor and the parameters of the op amp on the linearity is analyzed in detail. By optimizing the parameters of the op amp and using the polysilicon resistor with smaller voltage coefficient as the linearity The device has achieved high linearity. The circuit has been implemented CSMC0.6μm CMOS technology, the test results show that: the total harmonic distortion of the output of 0.0002%. Input dynamic range of 0 ~ 2.6V, the output current of 50 ~ 426μA The sensitivity of the PTAT reference current source to power variations is 0.021 7. The chip uses a 5V supply and consumes about 1.3mW of power with a chip area of 0.112mm2.