DCCII based frequency compensation method for three stage ampli ̄ers
- S. Shahsavari, S. Biabanifard, S. M. Hosseini Largani, O. Hashemipour
- AEU — Int. J. Electron. Commun
By using Gm-C compensation (GCC) technique, a two-stage recycling folded cascode (FC) operational transconductance ampli ̄er (OTA) is designed. The proposed con ̄guration consists of recycling structure, positive feedback and feed-forward compensation path. In comparison with the typical folded cascode CMOS Miller ampli ̄er, this design has higher DC gain, unitygain frequency (UGF), slew rate and common mode rejection ratio (CMRR). The presented OTA is simulated in 0.18m CMOS technology and the simulation results con ̄rm the theoretical analyses. Finally, the proposed ampli ̄er has a 111 dB open-loop DC gain, 20MHz UGF and 145 dB CMRR@ 1.2V supply voltage while the power consumption is 400 Wwhich makes it suitable for low-voltage applications.