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An offset compensated CMOS current-feedback operational-amplifier

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3 Author(s)
Zhu, J. ; Dept. of Electr. & Comput. Eng., Ecole Polytech. de Montreal, Que., Canada ; Sawan, M. ; Arabi, K.

A new CMOS current-feedback operational-amplifier (CFOA) with a novel on-chip current-mode input offset voltage compensation circuit is presented. The offset voltage is reduced to less than 1 mV by varying the bias currents of the amplifier's input buffer as a function of the mismatch between the NMOS and PMOS Vt's (Vin and V tp). The proposed compensation technique is suitable for both CMOS and BJT CFOA designs without degrading their high-frequency performance. As well, it is irrespective of process and temperature parameters because of its fully symmetrical architecture. Results of HSPICE simulation show that a GBW of around 100 MHz and a supply current of around 300 μA are achievable in a CMOS CFOA

Published in:

Circuits and Systems, 1995. ISCAS '95., 1995 IEEE International Symposium on  (Volume:3 )

Date of Conference:

30 Apr-3 May 1995