Input amplifier stage in the AB class having a controlled...

Details Input amplifier stage in the AB class having a controlled... Input amplifier stage in the AB class having a controlled...

2007-09-25

2007-09-25

Lee, Benny (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S257000, C330S260000

Reexamination Certificate

active

11069838

ABSTRACT:
The invention relates to an input amplifier stage, in AB class, having a controlled bias current and comprising a differential cell, inserted between a first supply voltage reference and a second voltage reference, having a differential pair of input transistors receiving respective differential signals and a pair of bias transistors, as well as an output-buffer circuit portion coupled to the cell by means of at least a supplementary parallel branch of transistors. This stage also comprises an additional circuit block, able to output the absolute value of an input current, inserted between a node of the differential cell of the input stage and a node of the supplementary branch in order to add the absolute value of a portion of the signal current to the differential cell bias current.

REFERENCES:
patent: 5909136 (1999-06-01), Kimura
patent: 6008667 (1999-12-01), Fahrenbruch
patent: 6100762 (2000-08-01), Kato
patent: 6771126 (2004-08-01), Blankenship et al.
patent: 6804477 (2004-10-01), Maruyama

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