ChikumaMatsumara
Newbie level 4
folded cascode with class ab output stage
I've designed a folded cascode op amp that used 3.3V supply and it operates properly (according to spec). However, when I included the class AB output stage, the op amp is not functioning...and some of the transistor at the input stage are operating in triode region. Does anyone had any idea about this?
Design spec:
Vsupply = 0~3.3V
GBW = 10MHz
Output swing = Rail to rail
Av > 70dB
(Referring to the op amp configuration) If I want to remove the cascode transistor for the current sourcing of the differential amplifier ( M8 - in order to acquire voltatge headroom), should I remove transistor M17? *(this is for the case of low voltage op amp)
Attached here is the simulation file of the op amp. I'm still learning; if I did any mistake please inform me. I really appreciate that.
I've designed a folded cascode op amp that used 3.3V supply and it operates properly (according to spec). However, when I included the class AB output stage, the op amp is not functioning...and some of the transistor at the input stage are operating in triode region. Does anyone had any idea about this?
Design spec:
Vsupply = 0~3.3V
GBW = 10MHz
Output swing = Rail to rail
Av > 70dB
(Referring to the op amp configuration) If I want to remove the cascode transistor for the current sourcing of the differential amplifier ( M8 - in order to acquire voltatge headroom), should I remove transistor M17? *(this is for the case of low voltage op amp)
Attached here is the simulation file of the op amp. I'm still learning; if I did any mistake please inform me. I really appreciate that.