一种用于模数转换器的高性能差分参考电压源

A High Performance Differential Reference Voltage Generator Used in ADC

介绍了一种可直接应用于模数转换器的低功耗、高性能差分参考电压源.它采用新型结构的带隙基准源产生高精度温度补偿的参考电流,参考电流通过跨导缓冲器直接转换成所需的差分参考电压.该差分电压精度高、温漂小、抗干扰能力强.电路选用TSMC0·18μmCMOS工艺实现,芯片面积为250μm×350μm.经测量,电路功耗为0·9mW,输出差分参考电压的平均温度系数为9·5×10-6K-1.

A differential reference voltage generator with low power consumption and good performance, which is used in ADC,is introduced. The high performance temperature-compensated reference current is generated with a new structure bandgap,and the current is converted to the needed reference directly through the transconductor buffer. The differential voltage has high precision,low temperature-drift,and good anti-jamming ability. The circuit is realized with the TSMC 0.18/μm CMOS process and the die area is 250μm×350μm. The chip has been tested. The power consumption is 0.9mW and the average temperature coefficient of the output differential reference voltage is 9.5 × 10^-6K^-1.