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Design of two-stage MOSFET-only operational amplifiers

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2 Author(s)
Aminzadeh, H. ; EE Dept., Ferdowsi Univ. of Mashhad, Mashhad, Iran ; Danaie, M.

In this work, the gate-to-bulk capacitance property of MOS transistors is employed to design high-speed two-stage operational amplifiers (opamp). Traditional design of two-stage opamps recommends MIM or PIP capacitors to avoid instability in closed-loop applications. In addition to area efficiency achieved by replacing these capacitors with MOS transistors, the integration of the opamp would become compatible with standard digital CMOS technologies. Circuit-level simulation compares two opamps that are designed to be employed in a 50MS/s switched-capacitor sample-and-hold circuit. For the same specifications in 0.18¿m CMOS technology, the proposed MOSFET-only opamp is about 52% smaller than a conventionally design when neglecting the signal path capacitors.

Published in:

Microelectronics, 2008. ICM 2008. International Conference on

Date of Conference:

14-17 Dec. 2008