Title :
A high speed and high linearity OTA in 1-V power supply voltage
Author :
Lo, Tien-Yu ; Hung, Chung-Chih
Author_Institution :
Dept. of Commun. Eng., National Chiao Tung Univ., Hsinchu
Abstract :
This paper proposes a high performance operational transconductance amplifier (OTA) which is based on the pseudo-differential architecture with addition of linearity improved circuits. The OTA is designed under low power supply voltage consideration while its gain, excess phase, and linearity are well maintained. A common-mode control system, including common-mode feedback (CMFB) and common-mode feedforward (CMFF) circuits, is added to ensure stability at high frequency. Results show that the topology can achieve the total harmonic distortion (THD) to the -56dB with 100MHz balanced differential input signals up to 300mVpp at 1-V supply voltage by the TSMC 0.18mum CMOS process. Its power consumption is 1.8mW
Keywords :
CMOS integrated circuits; circuit feedback; differential amplifiers; feedforward amplifiers; operational amplifiers; power supply circuits; 0.18 micron; 1 V; 1.8 mW; CMOS process; OTA; common-mode control system; common-mode feedback circuit; common-mode feedforward circuits; linearity improved circuits; operational transconductance amplifier; power supply voltage; pseudodifferential architecture; total harmonic distortion; Circuit stability; Circuit topology; Control systems; Feedback circuits; Frequency; Linearity; Low voltage; Operational amplifiers; Power supplies; Transconductance;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1692972
