jutek
Full Member level 4
low voltage buffer
hello
i'm trying to design a low voltage buffer. i use the circuit as attached.
low voltage operation is great. i mean for vdd=1.3V it works very good. rail to rail input ensures wide input swing. the opamp works in a unity buffer configuration. with 10uA biasing it has enough driving capabilities for me.
the problem is it doesn't want to work so good for vdd=3.3V. Output swing is quite low.
How to redesign it to have wide output swing also for vdd=3.3V ?
I'd like the out to be about 0.2V - 3.1V
In my design the vdd is variable and changes from 1.3 to 3.3V
Any ideas help or links wanted
regards
hello
i'm trying to design a low voltage buffer. i use the circuit as attached.
low voltage operation is great. i mean for vdd=1.3V it works very good. rail to rail input ensures wide input swing. the opamp works in a unity buffer configuration. with 10uA biasing it has enough driving capabilities for me.
the problem is it doesn't want to work so good for vdd=3.3V. Output swing is quite low.
How to redesign it to have wide output swing also for vdd=3.3V ?
I'd like the out to be about 0.2V - 3.1V
In my design the vdd is variable and changes from 1.3 to 3.3V
Any ideas help or links wanted
regards
