Abstract: To solve the problems of narrow adjustment control range,large linearity error and high power consumption of current voltage to frequency converter(VFC),a kind of 0.25 μm BiCMOS VFC was designed. Twostage low voltage cascode operational amplifier was adopted in voltage to current converter(VCC). Negative feedback was respectively introduced into VCC,charge and discharge circuit and voltage testing circuit,which formed two closedloop systems. BJT electronic switching cell and CMOS feedback gate circuit were linked to form interlock and the whole circuit consisted BiCMOS VFC with adjustment control. The simulation and hardware circuit experiments were carried out. The results show that the ideal linear range of output frequency is 0-60 MHz for a given input voltage range of 0-1.0 V, while the real linear range is 100 Hz-58.5 MHz with the linear error lower than 1%. The power consumption of 230 μW is a litter higher than the same kind CMOS VFC,but the performances of bandwidth,linearity and antijamming are greatly improved.The proposed VFC is suitable for low voltage and remote measurement systems with high precision control.
成立, 严鸣, 丁玲, 杨宁, 王振宇. 采用二重闭环互锁调控技术的BiCMOS VFC[J]. 江苏大学学报(自然科学版), 2011, 32(6): 678-682.
CHENG Li, YAN Ming, DING Ling, YANG Ning, WANG Zhenyu. A kind of BiCMOS voltage to frequency converter using double closed-loop interlock and adjustment control technologies[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2011, 32(6): 678-682.