一种高性能BiCMOS差分参考电压源

采用电流求和结构,提出了一种高性能BiCMOS差分参考电压源,引入零反馈补偿技术有效提高了差分参考电压的电源抑制比,电流求和温度补偿技术保证了差分参考电压的高精度、低温漂.基于ASMC0.35μm 3.3VBiCMOS工艺的仿真和测试结果表明,在低频和100MHz时,参考差分电压对电源噪声抑制比为78.1dB和66.7dB,对地线噪声抑制比为72.4dB和63.8dB,输出差分参考电压的平均温度系数为11×10-6/℃,有效芯片面积为2.2mm2,功耗小于15mW,可应用于14位100MHz流水线模/数转换中.

High performance BiCMOS differential reference voltage generator

A high performance BiCMOS differential reference voltage generator with a current summing architecture is presented.The power supply rejection ratio(PSRR) is improved by using feedback-zero compensation.A high precision and low temperature drift are attained in the current summing temperature compensation mode.In the ASMC 0.35 μm 3.3V BiCMOS process,the differential reference voltage generator is simulated and tested below: At a low frequency and at 100 MHz,the positive power supply rejection ratio(PSRR+) is 78.1 dB and 66.7 dB,respectively,the negative power supply rejection ratio(PSRR-) is 72.4 dB and 63.8 dB,respectively,the average temperature coefficient of the output differential reference voltage is 11×10-6/℃,the active area is 2.2 mm2,and the power comsumption is less than 15 mW.This proposed differential reference voltage generator can be applied in a 14 bit 100 MHz pipeline ADC.