How to design a rail-to-rail OPA ?

[benever]

can someone tell me how to design a rail_to_rail opa
especial at the output level (in details to explain it)

thanks!

 

[safwatonline]

rai_to_rail

i think u need something like output stage with minimum number of devices to allow a good swing

 

[cougar168]

Re: rai_to_rail

The equal or more important thing is the input and summing circuits

 

[isaacnewton]

Re: rai_to_rail

For output stage, you have to use Common Source/Common Emitter, instead Voltage Follower.

can someone tell me how to design a rail_to_rail opa
especial at the output level (in details to explain it)

thanks!

 

[Areky_qin]

rai_to_rail

 

[kumard35b]

Re: rai_to_rail

you can have output stage as buffers ie depends on the stage you want ie inverting or non inverting...but before going to the inverter stage you need the summing circuits ..the summing circuit may be wide swing cascode current mirror..
if you are too limitation about current you can choose the coupling network for the differential ...so that you can convert the output into rail to rail then you can connect to the inverted buffers...if you have doubt ..tell me i will upload the document...