A 0.8-V 0.25-mW Current-Mirror OTA With 160-MHz GBW in 0.18-$\mu{\hbox {m}}$ CMOS

A low-voltage low-power CMOS operational transconductance amplifier (OTA) with near rail-to-rail output swing is presented in this brief. The proposed circuit is based on the current-mirror OTA topology. In addition, several circuit techniques are adopted to enhance the voltage gain. Simulated from a 0.8-V supply voltage, the proposed OTA achieves a 62-dB dc gain and a gain-bandwidth product of 160 MHz while driving a 2-pF load. The OTA is designed in a 0.18-mum CMOS process. The power consumption is 0.25 mW including the common-mode feedback circuit

[1]  Eby G. Friedman,et al.  A bulk-driven CMOS OTA with 68 dB DC gain , 2004, Proceedings of the 2004 11th IEEE International Conference on Electronics, Circuits and Systems, 2004. ICECS 2004..

[2]  Robert G. Meyer,et al.  Relationship between frequency response and settling time of operational amplifiers , 1974 .

[3]  B. A. Wooley,et al.  A 1.8-V digital-audio sigma-delta modulator in 0.8-/spl mu/m CMOS , 1997 .

[4]  Michiel Steyaert,et al.  Erratum to "A 1-V 140-μW 88-dB Audio Sigma-Delta Modulator in 90-nm CMOS" , 2009, IEEE J. Solid State Circuits.

[5]  B. Wooley,et al.  A 1.8-V digital-audio sigma-delta modulator in 0.8-μm CMOS , 1997, IEEE J. Solid State Circuits.

[6]  A.J. Lopez-Martin,et al.  Low-Voltage Super class AB CMOS OTA cells with very high slew rate and power efficiency , 2005, IEEE Journal of Solid-State Circuits.

[7]  Gabriel A. Rincon-Mora,et al.  Designing 1-V op amps using standard digital CMOS technology , 1998 .

[8]  Ramón González Carvajal,et al.  New low-voltage class AB/AB CMOS op amp with rail-to-rail input/output swing , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[9]  M. Steyaert,et al.  A 0.8-V, 8-/spl mu/W, CMOS OTA with 50-dB gain and 1.2-MHz GBW in 18-pF load , 2003, ESSCIRC 2004 - 29th European Solid-State Circuits Conference (IEEE Cat. No.03EX705).

[10]  David A. Johns,et al.  Analog Integrated Circuit Design , 1996 .

[11]  P. Kinget,et al.  0.5-V analog circuit techniques and their application in OTA and filter design , 2005, IEEE Journal of Solid-State Circuits.

[12]  W. Sansen,et al.  A 1-V 140-/spl mu/W 88-dB audio sigma-delta modulator in 90-nm CMOS , 2004, IEEE Journal of Solid-State Circuits.

[13]  Kenneth R. Laker,et al.  Design of analog integrated circuits and systems , 1994 .