Operational amplifier having rail to rail input/output ability
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United States of America Patent
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Jun 1, 1999
Grant Date -
N/A
app pub date -
Jun 5, 1997
filing date -
Aug 29, 1996
priority date (Note) -
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Abstract
An operational amplifier having a high voltage power supply and a low voltage power supply receives first and second input signals and amplifies a voltage difference between the first and second input signals to generate an amplified signal. The operational amplifier has a first differential amplifier having a pair of first type transistors that are activated by the first and second input signals having a voltage greater than the voltage of the low voltage power supply. The first differential amplifier transmits a first output signal (S1) in response to the voltage difference between the first and second input signals. A second differential amplifier has a pair of second type transistors that are activated by the first and second input signals having a voltage smaller than the voltage of the high voltage power supply. The second differential amplifier transmits a second output signal (S2) in response to the voltage difference between the first and the second input signals. An output circuit synthesizes the first and second output signals. The output circuit is activated by a synthesized signal to transmit the amplified signal.
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