| 摘要 |
PURPOSE: An operational amplifier with a self control circuit for realizing a high slew rate throughout a full operating range is provided to obtain the high slew rate without an external control circuit by increasing current values of differential input stages without using external signals. CONSTITUTION: An operational amplifier includes a pair of first differential transistors, a pair of second differential transistors, a first current source circuit, a second current source circuit, an output terminal, a first transistor, a second transistor, an output driver stage circuit, a first phase inverter circuit, and a second phase inverter circuit. The first differential transistors are disposed between a first power supply conductor and a second power supply conductor in order to receive differential input signals at a first differential input terminal(101) and a second differential input terminal(102). The second differential transistors are disposed between the first power supply conductor and the second power supply conductor in order to receive the differential input signals at a third differential input terminal and a fourth differential input terminal. The first current source circuit(103) is connected between the first differential transistor pair and the second power supply conductor. The second current source circuit(104) is connected between the second differential transistor pair and the first power supply conductor. The output terminal is used for outputting output signals. The first transistor is used for sourcing a drive output current via the output terminal. The second transistor is used for sinking a drive output current via the output terminal. The output driver stage circuit is used for controlling the drive output current corresponding to a signal output potential level of the output signal. The first phase inverter circuit(105) is used for controlling circuit current of the first differential transistors. The second phase inverter circuit(106) is used for controlling circuit current of the second differential transistors.
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