Design of Low-Power CMOS OTA Using Bulk-Drive Technique

Subject Areas : Semiconductor devices

Maryam  Ghadiri Modarres ¹ (MSc. – Department of Electrical Engineering, Teacher of Isfahan Education (District 4), Isfahan, Iran)

Received: 2015-02-01 Accepted : 2015-09-24 Published : 2015-11-01

Keywords: Low power, OTA, body effect, bulk driven,

Abstract :

This paper presents the design of low power CMOS- OTA (operational transconductance amplifier) using bulk drive (BD) technique with broad band. This technique is used for design of low power circuits with broad band for high frequency users, for example communication systems, mobile communication and communication forming of medical electronics. OTA is the base of amplifier .It is a fundamental building part of analog systems. Recently analog designer has been paid to low voltage (LV),low power (LP) integrated circuits. Many techniques are used for the design of LV LP circuits, the bulk driven offers principle this designs. This paper suggests a bulk driven OTA in standard CMOS processes and supply voltage 0.8 volt DC. It used of improved wilson current mirror. The simulation results have been carried out by the HSPICE simulator in 180 nm CMOS technology. The open loop gain is enhanced to 17.4dB at unity gain band with (UGB) of 26.1 MHZ with sufficient output swing. Power consumption of the OTA is in range of few hundreds of nanowatts (6%).

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