Compact low-power class AB amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

Reexamination Certificate

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Reexamination Certificate

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07859338

ABSTRACT:
A compact low-power class AB power amplifier design is provided. In an embodiment, the amplifier design eliminates an intermediate stage that couples an input stage and a biasing mesh of the amplifier. In another embodiment, the amplifier design reuses a tail current from the input stage to bias the biasing mesh. Accordingly, a much higher power efficiency can be achieved using the proposed amplifier design compared to conventional class AB amplifiers. Further, the proposed amplifier design is extremely compact and occupies a small silicon area.

REFERENCES:
patent: 5748040 (1998-05-01), Leung
patent: 5907259 (1999-05-01), Yamada et al.
patent: 7358812 (2008-04-01), Portmann et al.
patent: 7557658 (2009-07-01), Perez

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