Power-efficient class AB fully differential amplifier

J.M. Saso; A.J. Lopez-Martin; M.P. Garde; J. Ramirez-Angulo

Power-efficient class AB fully differential amplifier

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Author(s): J.M. Saso¹ ; A.J. Lopez-Martin¹ ; M.P. Garde¹ ; J. Ramirez-Angulo²
- Affiliations: 1: Institute of Smart Cities , Public University of Navarra , 31007 Pamplona , Spain ;
  2: Klipsch School of Electrical & Computer Eng ., New Mexico State University , Las Cruces , NM 88003-0001 , USA
Source: Volume 53, Issue 19, 14 September 2017, p. 1298 – 1300
DOI: 10.1049/el.2017.2070 , Print ISSN 0013-5194, Online ISSN 1350-911X

Received 29/05/2017, Published 18/08/2017

A class AB one-stage fully differential amplifier is described. It includes adaptive biasing techniques to the conventional class A differential amplifier that improve linearity, gain-bandwidth product and slew rate, maintaining the same DC bias currents and supply voltage requirements. Boosting of dynamic currents for large input signals takes place at the output branches, without internal replication of these currents. This leads to a nearly 100% current efficiency. Measurement results for a 0.5 μm CMOS test chip prototype validate the proposal.

References

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Power-efficient class AB fully differential amplifier

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