我这边设计一个传感器信号放大电路，使用AD8630（单电源），传感器的输出信号频率为225kHz，幅度Vpp约为15mV，运放设计为放大10倍，发现运放的输出端没有输出放大后的信号。将放大倍数改为100倍也一样，将传感器信号改为30kHz，也是一样没有放大后的信号。不知是什么原因，自己猜测：
1、是不是AD8630高频响应不好？
2、是不是AD8630的输入端对小信号响应不好，不是JFET型的？输入的信号幅度太小了？
3、应该用正负电源？？
如果AD8630不合适，该选择什么样的运放，重点看运放的哪些指标…
Hi,
I will check if there is available data or graph for AD8630 current noise.
可以考虑AD8630 ADA4528-1， 低失调电压，地失调电压温漂，
由于带宽的限制，一颗运放往往无法满足要求
http://www.analog.com/cn/products/amplifiers/operational-amplifiers/zero…
Some suggestions:
AD8608
AD8694
AD8630
AD8604
I'm assuming you meant TSSOP14
John,
A couple more comments.
Op amps have a finite output impedance, so any C load will result in phase shift, degrading
loop stability. The AD8630 only has about 45 degrees phase margin on 2.7V, so a cable
a foot or so long can be problematic. I would…
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Hi everyone!
I'm new here so bare with me!
I'm looking for an op-amp with similar features/specs to the ADA4051, but in a PDIP packaging (throughhole/breadboard size). I have attached the data-sheet for the ADA4051, but my basic requirements…
