Design of bulk driven miller Operational Transconductance Amplifier

Author

Bhange, Kavita ; Zode, Pravin ; Zode, Pradnya

Author_Institution

Deptt. of Electron. Eng., Y.C. Col.l. of Eng., Nagpur, India

fYear

2015

fDate

28-30 May 2015

Firstpage

1567

Lastpage

1570

Abstract

This paper presents a simple technique to enhance the gain of Operational Transconductance Amplifier (OTA) operating at a low voltage. In conventional OTA, bulk driven differential pair is used for low voltage operation. However, it introduces a reduction in the g_mb/g_m ratio. The gain of OTA can be enhanced by increasing its transconductance. The proposed work uses input bulk-driven differential pair operating in weak inversion with positive feedback source degeneration technique to achieve a higher transconductance. This improves the gain of OTA without any change in the power consumption. A DC gain of 63 dB and a power consumption of 86.70 pW is obtained with a unity gain frequency of 4.87 Hz using 250nm CMOS technology at 2.5 V.

Keywords

CMOS analogue integrated circuits; feedback; integrated circuit design; operational amplifiers; CMOS technology; bulk driven differential pair; bulk driven miller operational transconductance amplifier; frequency 4.87 Hz; gain 63 dB; low voltage operation; positive feedback source degeneration technique; power 86.7 pW; size 250 nm; voltage 2.5 V; Transconductance; Bulk Driven Differential Pair; OTA; Source Degeneration; Weak Inversion;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Instrumentation and Control (ICIC), 2015 International Conference on

Conference_Location

Pune

Type

conf

DOI

10.1109/IIC.2015.7150999

Filename

7150999