A novel Operational Transconductance Amplifier with high Gm using improved differential current redistribution technique (DCRT)

Author

Jing Zhu ; Yunwu Zhang ; Weifeng Sun ; Shengli Lu

Author_Institution

Nat. ASIC Syst. Eng. Res. Center, Southeast Univ., Nanjing, China

fYear

2013

fDate

28-31 Oct. 2013

Firstpage

1

Lastpage

4

Abstract

A novel CMOS Operational Transconductance Amplifiers (OTA) featuring with excellent transconductance performance is described in this paper. The OTA utilizes the proposed differential current redistribution technique (DCRT) that adaptively distributes the differential current generated by the input differential voltage to get the high G_m performance. In addition, the linearity of the OTA is enhanced due to the optimized redistribution strategy the modified DCRT adopts. Moreover, good frequency behavior and excellent transient response of the proposed OTA are obtained thanks to the DCRT for the lack of internal nodes. The OTA implemented in a CSMC 0.5μm BCD technology only consumes 5mW. The DC gain of 90dB, unity gain bandwidth (UGB) of 200MHz is achieved and the slew rate is up to 60V/ns.

Keywords

CMOS analogue integrated circuits; operational amplifiers; CMOS; OTA; differential current redistribution technique; frequency 200 MHz; gain 90 dB; operational transconductance amplifier; power 5 mW; size 0.5 mum; CMOS integrated circuits; CMOS technology; Educational institutions; Gain; Transconductance; Transient response; Transistors; differential current redistribution technique (DCRT); high gain; linearity; operational transconductance amplifier (OTA); slew rate;

fLanguage

English

Publisher

ieee

Conference_Titel

ASIC (ASICON), 2013 IEEE 10th International Conference on

Conference_Location

Shenzhen

ISSN

2162-7541

Print_ISBN

978-1-4673-6415-7

Type

conf

DOI

10.1109/ASICON.2013.6812053

Filename

6812053