Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1997-09-23
2000-10-24
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330257, H03F 345
Patent
active
061373605
ABSTRACT:
A differential input comparison circuit of an operational amplifier circuit includes first and second input circuits having circuit structures based on a single input direction of an N channel. To a pair of input transistors of the first input circuit, a non-inverting input and an inverting input are directly applied, while to a pair of input transistors of the second input transistor, the inputs are applied via respective level shifters. When the inverting input is lowered, a threshold voltage of the pair of input transistors of the first input circuit cannot be ensured. To prevent this, each level shifter starts operating based on an instruction from a switching circuit to shift respective levels of the inputs to ensure the threshold voltage of the pair of input transistors of the second input circuit. As a result, the operational amplifier circuit can compare the inputs without problems, thereby providing a differential amplifier corresponding to a wide dynamic range which permits input/output operation in an entire range of a power source voltage.
REFERENCES:
patent: 4760346 (1988-07-01), Kultgen et al.
patent: 5604464 (1997-02-01), Hwang et al.
patent: 5764101 (1998-06-01), Archer
Schilling et al., Electronic Circuits, Discrete and Integrated, 2nd ed., McGraw-Hill, 1979, pp. 355-6.
Mottola Steven J.
Sharp Kabushiki Kaisha
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