MOS工艺下高摆幅共源共栅偏置电路

ascode Ampilifier can not only provide higher output resistance and larger gain if the load is also high resistance, but also reduce the Miller effect. So it can be used in many amplifiers field. This paper proposed a simple bias circuit that allows for maximum output voltage swing of MOSFET cascade stage in CMOS technics. The circuit is valid for any current density and is technology independent. According to the saturation voltage as defined in [1],and the current density of the cascade stage, we determine the aspect ratio of the transistor in the bias circuit in order to maximize the output swing .