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Current feedback amplifier design

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jayce3390

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current feedback amplifier

Hi,

I m trying to use a current feedback operational amplifier (analog device AD8001AR) due to high bandwidth capability.

I don't know why I can't get higher voltage gain as seen in following picture, the input voltage is 1V and the maximum output voltage obtained is 2.5 Volts.
I tried to adjust the voltage gain by varying the resistor called Rj.
The feedback resistor is not moving in order to keep the bandwidth.






Please, could you help me?
 

feedback amplifier design

As you can see from the waveforms, the output voltage is clipped at higher gain. Reduce the input voltage in your test!
 

current amplifier design

I can do that, but I need a voltage output peak higher than 20 Volts peak from an input voltage 1 V peak.

My test signal is consequently 1V. The DC supply voltage is +5V/-5V. Maybe output voltage can't reach higher value than DC voltage supply?
 

current feedback amplifier design

You're apparently joking, The supply voltage is +/- 5V.
 

current feedback

As a worst case, I am afraid that he is not joking.
 

feedback amplifier

Don't be afraid FvW, opa's domain is totally out of my speciality that's why I asked for support.
 

current feedback design

jayce3390 said:
Don't be afraid FvW, opa's domain is totally out of my speciality that's why I asked for support.
Click to expand...

Sorry for my impulsive and immediate reaction. But, of course you can´t get more signal voltage out of a circuit than the supply delivers.
 

how to design a current feedback amplifier

The OP's datasheet tells in detail about specified supply voltage range and achievable voltage swing.
AD8001 maximum supply would be +/-6 V. It simply isn't suitable for your requirements.

You surely need a +/-15V supply and an OP that is capable of driving more than 100 mA. It also must be able to handle the respective power dissipation.

I'm using e.g. a TI THS3001 for similar purposes. But it isn't guaranteed to drive +/-10 V in a 100 ohm load, typically it can.
 

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    jayce3390

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