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A high bandwidth constant gm and slew-rate rail-to-rail CMOS input circuit and its application to analog cells for low voltage VLSI systems

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1 Author(s)
Redman-White, W. ; Philips Semicond., Southampton, UK

A new rail-to-rail CMOS input architecture is presented that delivers behavior nearly independent of the common-mode level in terms of both transconductance and slewing characteristics. Feedforward is used to achieve high common-mode bandwidth, and operation does not rely on analytic square law characteristics, making the technique applicable to deep submicron technologies. From the basis of a transconductor design, an asynchronous comparator and a video bandwidth op amp are also developed, providing a family of general purpose analog circuit functions which may be used in high (and low) bandwidth mixed-signal systems. Benefits for the system designer are that the need for rigorous control of common-mode levels is avoided and input signal swings right across the power supply range can be easily handled. A further benefit is that having very consistent performance, the circuits can be easily described in VHDL (or other behavioral language) to allow simulation of large mixed-signal systems. The circuits presented may be easily adapted for a range of requirements. Results are presented for representative transconductor, op amp, and comparator designs fabricated in a 0.5 μm 3.3 V digital CMOS process

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:32 ,  Issue: 5 )

Date of Publication:

May 1997

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