Low Current Constant gm Technique for Rail to Rail Operational Amplifiers
This paper presents a new constant transconductance (gm) technique for rail to rail CMOS operational amplifier input stages. The proposed technique can provide a constant transconductance value over the whole common mode range with low current consumption. Also, the technique ensures no additional current at the output of the rail to rail input stage. To prove its advantages, the technique was integrated in a chopper stabilized operational amplifier. The simulation results show a transconductance variation of only 4% and a constant unity gain bandwidth.
2020 International Semiconductor Conference (CAS)