To solve the problem of traditional amplifiers that high unity-gain bandwidth is obtained in exchange of big-power, a low power wide band-width folded-cascode fully differential amplifier with cascode current-mirrors load is designed based on Smic0.18 um rf CMOS technology. Transitional capacitor and Miller capacitor are applied to enhance the stability of frequency-characteristic; Common-mode feedback circuit is added to stabilize the common-mode output voltage of differential structure; Test results show, with the power supply of 1.8V, the circuit has an open-loop gain of 76.07dB, a phase margin of 50.6°, a unity-gain bandwidth of 215.7MHz and a CMRR of 120dB, while consuming 1.75mW of power.

Date Published: 2 April 2010
PDF: 7 pages
Proc. SPIE 7651, International Conference on Space Information Technology 2009, 76512R (2 April 2010); doi: 10.1117/12.855496

Published in SPIE Proceedings Vol. 7651:
International Conference on Space Information Technology 2009
Xingrui Ma; Baohua Yang; Ming Li, Editor(s)