Title :
Leveraged current mirror op amp
Author :
Fox, R.M. ; Seo, I. ; Yeo, H. ; Jeon, O.
Author_Institution :
Dept. of Electr. & Comput. Eng., Florida Univ., Gainesville, FL, USA
Abstract :
A small change to the standard current mirror op amp configuration is shown to improve performance, with few, if any, disadvantages. Adding a pair of fixed current sources allows reduced operating-point current in the output stage, while the resulting "leveraging" effect increases slew rate. For equal total power dissipation, the new configuration improves DC gain and gain-bandwidth (GBW) over conventional current-mirror and folded cascode op amps, as shown by hand analyses and SPICE simulations. Also, because of increased input stage transconductance, the new configuration reduces thermal and flicker noise.
Keywords :
SPICE; circuit simulation; current mirrors; flicker noise; integrated circuit noise; operational amplifiers; thermal noise; DC gain; SPICE simulations; equal total power dissipation; fixed current sources; flicker noise; gain-bandwidth; input stage transconductance; leveraged current mirror op amp; operating-point current; slew rate; thermal noise; Analytical models; Circuit noise; Clamps; Degradation; Mirrors; Operational amplifiers; Power dissipation; SPICE; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on
Print_ISBN :
0-7803-7448-7
DOI :
10.1109/ISCAS.2002.1010635
