An improved source follower with wide swing and low output impedance

Author

Lai, Suming ; Zhang, Hong ; Chen, Guican ; Xu, Jianchao

Author_Institution

Dept. of Microelectron., Xian Jiaotong Univ., Xian

fYear

2008

fDate

Nov. 30 2008-Dec. 3 2008

Firstpage

814

Lastpage

817

Abstract

This paper presents a wide-swing source follower with resistive load capability designed in TSMC 0.18 mum CMOS technology. Two additional amplifiers are employed to enlarge its input swing. The resultant stability problem is solved by a simple compensation scheme based on analysis of the system transfer function. Under a 1.8V supply the source follower, when loaded by a 1KOmega resistor and shifting the level of 500 mV, achieves total harmonic distortion (THD) of -95.6 dB with 0.2V_pp input and -67.6 dB with 1.2V_pp input at 10 MHz respectively.

Keywords

CMOS integrated circuits; amplifiers; harmonic distortion; integrated circuit design; transfer functions; CMOS technology; frequency 10 MHz; resistance 1 kohm; resistive load capability; resultant stability problem; size 0.18 mum; total harmonic distortion; transfer function; voltage 1.8 V; voltage 500 mV; wide-swing source follower; CMOS technology; Character generation; Circuit stability; Feedback; Frequency; Impedance; MOSFETs; Rail to rail amplifiers; Resistors; Threshold voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2008. APCCAS 2008. IEEE Asia Pacific Conference on

Conference_Location

Macao

Print_ISBN

978-1-4244-2341-5

Electronic_ISBN

978-1-4244-2342-2

Type

conf

DOI

10.1109/APCCAS.2008.4746147

Filename

4746147