Title :
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
fDate :
Nov. 30 2008-Dec. 3 2008
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 0.2Vpp input and -67.6 dB with 1.2Vpp 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;
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
DOI :
10.1109/APCCAS.2008.4746147
