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why cascode structure is not used in PA applications?

时间:04-07 整理:3721RD 点击:
Hi Guys
It looks like most of the power amplifier use one transistor structure. What is the disadvantages of cascode structure in PA applications? I thought the cascode structure can improve stability, increase the bandwidth of the amplifier. Why is it not used for PA applications?
Thanks

less voltage swing, and power lost in a fixed resistor to the power supply.

They are used with CMOS transistors for low and moderate power levels.
But at higher power levels, single ended and push-pull configurations are more convenient.

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