Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-03-14
2006-03-14
Nguyen, Ling Van (Department: 2819)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S255000
Reexamination Certificate
active
07012465
ABSTRACT:
A programmable, rail-to-rail, low-voltage, micro-power harmonic-mean class-AB output stage with MOS devices employed in weak inversion is provided. The output stage MOS devices are arranged in the translinear loop, which avoids having a plurality of MOS devices in series between the power supply rails and thus enables low-voltage operation. The MOS devices in the translinear loop are used to implement the harmonic mean function x*y=z*(x+y) where x and y are mirrored to the output and represent the quiescent push and pull currents, respectively. Circuit operational parameters may be varied to suit a variety of different applications. Increasing the supply voltage for given quiescent current will advantageously increase the maximum current load. Increasing the quiescent current for given supply voltage will advantageously lower the distortion of the output stage.
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Greenhaus Bruce W.
Kordich Donald C.
Nguyen Ling Van
Qualcomm Incorporated
Wadsworth Philip
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