Amplifier biasing: Methodology?
时间：04-05
整理：3721RD
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Hi,
I′m working with Virtuoso/Spectre in the design of a low noise amplifier. The very first thing to choose is a proper transistor operating point which provides a good compromise between noise figure (low current) and high gain (high current). I′ve been told that the first thing is to define the appropriate current density (J_c) for the required noise figure but I don′t have the technology minimum noise figure specifications nor its corresponding optimum biasing.
How can I do this? Should I set a minimum transistor size and perform a sweep over different collector currents (I_c) for obtaining different J_c and look at the noise figure/maximum available gain results to decide which current to choose? Or how do you evaluate the right J_c for your application?
I′m working with Virtuoso/Spectre in the design of a low noise amplifier. The very first thing to choose is a proper transistor operating point which provides a good compromise between noise figure (low current) and high gain (high current). I′ve been told that the first thing is to define the appropriate current density (J_c) for the required noise figure but I don′t have the technology minimum noise figure specifications nor its corresponding optimum biasing.
How can I do this? Should I set a minimum transistor size and perform a sweep over different collector currents (I_c) for obtaining different J_c and look at the noise figure/maximum available gain results to decide which current to choose? Or how do you evaluate the right J_c for your application?