摘要
A multifunctional programmable gain amplifier（PGA） that provides gain and offset adjusting abilities for high-definition video analog front-ends（AFE） is presented. With a switched-capacitor structure, the PGA also acts as a sample and holder of the analog-to-digital converter（ADC） in the AFE to reduce the power consumption and chip area of the whole AFE. Furthermore, the PGA converts the single-ended video signal into differential signal for the following ADC to reject common-mode noise and interferences. The 9-bit digital-to-analog converter（DAC） for gain and offset adjusting is embedded into the switched capacitor networks of the PGA. A video AFE integrated circuit based on the proposed PGA is fabricated in a 0.18- m process. Simulation and measurement results show that the PGA achieves a gain control range of 0.90 to 2.34 and an offset control range of –220 to220 mV while consuming 10.1 mA from a 1.8 V power supply.
A multifunctional programmable gain amplifier（PGA） that provides gain and offset adjusting abilities for high-definition video analog front-ends（AFE） is presented. With a switched-capacitor structure, the PGA also acts as a sample and holder of the analog-to-digital converter（ADC） in the AFE to reduce the power consumption and chip area of the whole AFE. Furthermore, the PGA converts the single-ended video signal into differential signal for the following ADC to reject common-mode noise and interferences. The 9-bit digital-to-analog converter（DAC） for gain and offset adjusting is embedded into the switched capacitor networks of the PGA. A video AFE integrated circuit based on the proposed PGA is fabricated in a 0.18- m process. Simulation and measurement results show that the PGA achieves a gain control range of 0.90 to 2.34 and an offset control range of –220 to220 mV while consuming 10.1 mA from a 1.8 V power supply.
基金
Project supported by the National Natural Science Foundation of China(No.61106027)
the Science and Technology Project of Shanxi Province(No.2014K05-14)
