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A -90-dB THD rail-to-rail input opamp using a new local charge pump in CMOS

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2 Author(s)
T. A. F. Duisters ; Philips Res. Lab., Eindhoven, Netherlands ; E. C. Dijkmans

This paper describes the principle and design of a CMOS rail-to-rail input operational amplifier with THD performance of -90 dB which is suited for high-quality audio systems. A new output stage has been used featuring an output suing that extends to either supply rail and is capable of driving a low ohmic load (32 Ω). The opamp, which is realized in a 0.5-μm 3.3-V digital CMOS process, uses a standard two-stage Miller configuration. The rail-to-rail input functionality is achieved with a new area-efficient on-chip charge pump which provides the local supply voltage for the input differential pair. THD levels below -90 dB have not yet been shown with existing rail-to-rail techniques. This rail-to-rail input configuration also behaves independently of the common mode level with respect to transconductance and slewing characteristics

Published in:

IEEE Journal of Solid-State Circuits  (Volume:33 ,  Issue: 7 )