Title: A -90-dB THD rail-to-rail input opamp using a new local charge pump in CMOS
Abstract: 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 /spl Omega/). The opamp, which is realized in a 0.5-/spl mu/m 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.
Publication Year: 1998
Publication Date: 1998-07-01
Language: en
Type: article
Indexed In: ['crossref']
Access and Citation
Cited By Count: 78
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