access icon free Power-efficient class AB fully differential amplifier

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.

Inspec keywords: differential amplifiers; CMOS integrated circuits

Other keywords: slew rate; size 0.5 mum; DC bias currents; adaptive biasing techniques; CMOS test chip prototype; dynamic currents; supply voltage requirements; power-efficient class AB fully differential amplifier; gain-bandwidth product; efficiency 100 percent; class A differential amplifier

Subjects: CMOS integrated circuits; Amplifiers

References

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      • 5. Chatterje, S., Tsividis, Y., Kinget, P.: ‘A 0.5-V bulk-input fully differential operational transconductance amplifier’. European Solid State Circuits Conf., Leuven, Belgium, September 2004, pp. 147150, doi: 10.1109/ESSCIR.2004.1356639.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el.2017.2070
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