论文部分内容阅读
This paper presents an analog predistortion circuit for RF optical fiber links.The circuit consists of two source-coupled differential transconductance amplifiers which could provide linear and nonlinear transfer characteristics by adjusting the bias voltage and the transistor sizes.The circuit was designed and realized in a standard 0.18-μm CMOS technology of SMIC.The chip occupies 0.48×0.24 mm2.The DC supply is 3.3 V.Using this circuit,the third-order intermodulation distortion (IMD) suppression of a directly modulated RF optical fiber link can be improved by 9-16 dBc at relatively low cost.
This paper presents an analog predistortion circuit for RF optical fiber links. The circuit consists of two source-coupled differential transconductance amplifiers which could provide linear and nonlinear transfer characteristics by adjusting the bias voltage and the transistor sizes. The circuit was designed and realized in a standard 0.18-μm CMOS technology of SMIC.The chip occupies 0.48 × 0.24 mm2.The DC supply is 3.3 V.Using this circuit, the third-order intermodulation distortion (IMD) suppression of a directly modulated RF optical fiber link can be improved by 9-16 dBc at relatively low cost.