The user asked why the ADHV4710 in a constant current source circuit can only achieve ±1A output current when its open-loop gain is set to 1 (follower mode) and the BAV199 diodes are removed. The final answer explains that the ADHV4710 integrates the error amplifier and power transconductance, so high closed-loop gain and input clamping limit the differential error, effectively clamping the output current. The accompanying answer suggests that the ADHV4702+MOS configuration works because the power transconductance is outside the op-amp's closed loop, and recommends not amplifying at the ADHV4710 stage but instead using the ADA4522 for amplification.
AI Generated Content
如图所示的恒流源电路，只有去掉两个BAV199已经将ADHV4710的开环增益改为1（跟随器模式）才能有±1A的横流输出，如果开环增益增大输出电流就会被钳位，这是什么原因？