I need to design a input-buf for a SAR ADC.The architecture was showed in pic.
The loading of first opamp is resistors and the second is cap.So the first opamp
I want to use telescope casode architecture without output buffer for first opamp.
And the second with class AB output buffer to drive the cap loading.
Is that right?Any problem?
telescopic can not be used as buffer, so you can not use it as first opamp. and you should also consider the opamp gain as its load is resistor, resistor load will reduce the gain. Maybe folded-cascode is ok.
telescopic can not be used as buffer, so you can not use it as first opamp. and you should also consider the opamp gain as its load is resistor, resistor load will reduce the gain. Maybe folded-cascode is ok.
telescopic can not be used as buffer, so you can not use it as first opamp. and you should also consider the opamp gain as its load is resistor, resistor load will reduce the gain. Maybe folded-cascode is ok.
For first opamp,amplifier with output buffer stage may be need because of resistors loading?
For second,OTA means no output buffer stage amplifier,so the simple folded cascode is ok.