用于光通信系统的BiCMOS F/V转换器

BiCMOS F/V Converter for Photo-communication Systems

设计了一种由3运放A1、A2和A3组成的BiCMOS频率/电压(F/V)转换器,其中A1、A2设计成共源-共源CMOS运放,而低通滤波器(LPF)中的A3采用BiCMOS运放。优选了整个F/V转换器的元器件参数,并采取了提速和降耗等措施。实验结果表明,所设计的转换器输入至LPF的脉冲信号频率f2与输入信号频率fi相等,且该转换器输出电压平均值Uo与fi成正比;它可在4 Hz≤fi≤10 kHz的范围内工作,其综合性能指标——延迟-功耗积约为1.09 nJ,转换线性度仅为1.7×10-2,因而特别适用于低功耗、高线性度的光纤通信和光电检测系统中。

A BiCMOS F/V converter including 3 operational amplifiers A1, A2 and Aa was designed, in which A1 and A2 were double common-source CMOS operational amplifiers and the low-pass filter （LPF） A3 was a BiCMOS one. The parameters of the entire converter were optimized and some measures were adopted such as raising speed and reducing powerconsumption. The experimental results show that the its input pulse signal frequency f2 to the LPF is equal to the input signal frequency fi, and its average-output-voltage （Uo） is in direct proportion to fi. The designed converter can work properly within 4 Hz-10 kHz, and its delaypower product is about 1. 09 nJ, and the conversion linearity is only 1. 7×10^-2. With these characteristics, the designed converter is very suitable for low-consumption and high-linearity fiber-optic communications and photoelectric detection systems.