这个电路里面。U4 TL082需要的是一个开环增益小的运放,最终想要实现的是一个交流恒流源,输出的电流要有5A,负载的功率为50W,这个地方U4的开环增益要是合适值才能保证MOS管工作在线性工作区,而且还要保证交越失真不明显!在TI的运放选型上没看见有开环增益这个选项,不怎么好筛选。
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