Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Reexamination Certificate
2005-04-12
2005-04-12
Nguyen, Khanh V. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
C330S255000
Reexamination Certificate
active
06879213
ABSTRACT:
A circuit is used in the output stage of an operational amplifier which allows a rail to rail swing of the output voltage while consuming low quiescent power. The circuit includes first and second control elements each having a controllable path and a control node. The circuit further includes a third control element having a controllable path connected between the control nodes of the first and second control elements via a resistive path. A voltage indicative of an input signal is applied to a node of the resistive path. Current flow through the controllable paths of the first and second control elements changes in response to changes in the voltage at the node. More specifically, current flow through the controllable path of the second control element changes in dependance on the current flow through the controllable path of the third control element. Additionally, as one of the first and second control elements is turned on, the other control element is held off.
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Jenkens & Gilchrist PC
Nguyen Khanh V.
STMicroelectronics Limited
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