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need help in wide band opamp design

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tavakoli

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i wanna design a bipolar wide band opamp with rail to rail swing and gain about 110dB that have a capacitance load of size 1nf

please help me in possible configuration for better band width and a good compensation algorithm for best performance .....

thanx
 

Well, the 110 dB gain, if at dc, is no problem. However, the 1 nF cap load will always make your ampflifier act as an integrator. If your target is high gain at high frequency, you have to use some inductors, and that will make it narrow-band.

If your target is high Gain-bandwidth product, then you may try cascade. However, watch out the phase margin if you NEED to use the ampflier in a feedback structure. Note that not all high-gain ampflier is needed in a feedback loop, and in that case, you can ignore phase margin.

If the max C-input is not specified, you can of course use large transistors to achieve better gain, however, this is usually not the case.

tavakoli said:
i wanna design a bipolar wide band opamp with rail to rail swing and gain about 110dB that have a capacitance load of size 1nf

please help me in possible configuration for better band width and a good compensation algorithm for best performance .....

thanx
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