Symmetrical analog power amplifier

Amplifiers – With semiconductor amplifying device – Including differential amplifier

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330255, 330261, H03F 345

Patent

active

060577347

ABSTRACT:
A symmetrical analog power amplifier employing CMOS technology comprising an input stage and an improved output stage having a pull up/down arrangement to provide improved operating characteristics. The amplifier includes a pair of input transistors that receive an input signal and a node on which a first output voltage is generated. The amplifier further includes an improved output stage comprising an intermediate current source circuit that includes a first current source transistor, a control transistor and a second current source transistor connected in series. A first output voltage is generated on a node interconnecting the control transistor and the second current source transistor. A second output voltage, which is responsive to the first output voltage, is generated on a node connecting the first current source transistor and the control transistor. The output stage further includes a first output transistor responsive to the first output voltage and a second output transistor responsive to the second output voltage. A third output voltage, which is the output voltage of the amplifier, is generated on an output node interconnecting the first and second output transistors. A power down circuit may be embodied in the amplifier to reduce its power consumption.

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