OPERATIONAL AMPLIFIER AND LIQUID CRYSTAL DRIVE DEVICE USING SAME, AS WELL AS PARAMETER SETTING CIRCUIT, SEMICONDUCTOR DEVICE, AND POWER SUPPLY UNIT
First Claim
1. An operational amplifier comprising:
- at least one differential input part for generating a voltage signal corresponding to an electric potential difference between a positive-phase input signal and a negative-phase input signal by using a differential pair configured from a pair of transistors;
an output part for generating and outputting an output signal of a logic level corresponding to the voltage signal generated by the differential input part;
at least one auxiliary current generator for detecting a sudden change in the positive-phase input signal or the negative-phase input signal and generating an auxiliary current; and
a drive current generator for adding together a predetermined reference current and the auxiliary current and generating a drive current of the differential input part.
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Accused Products
Abstract
The operational amplifier according to the present invention has at least one differential input part for generating a voltage signal corresponding to an electric potential difference between a positive-phase input signal and a negative-phase input signal by using a differential pair configured from a pair of transistors; an output part for generating and outputting an output signal of a logic level corresponding to the voltage signal generated by the differential input part; at least one auxiliary current generator for detecting a sudden change in the positive-phase input signal or the negative-phase input signal and generating an auxiliary current; and a drive current generator for adding together a predetermined reference current and the auxiliary current and generating a drive current of the differential input part.
63 Citations
23 Claims
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1. An operational amplifier comprising:
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at least one differential input part for generating a voltage signal corresponding to an electric potential difference between a positive-phase input signal and a negative-phase input signal by using a differential pair configured from a pair of transistors; an output part for generating and outputting an output signal of a logic level corresponding to the voltage signal generated by the differential input part; at least one auxiliary current generator for detecting a sudden change in the positive-phase input signal or the negative-phase input signal and generating an auxiliary current; and a drive current generator for adding together a predetermined reference current and the auxiliary current and generating a drive current of the differential input part. - View Dependent Claims (2, 3, 4, 5)
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6. A liquid crystal drive device comprising a unit gain amplifier provided in a signal path to a liquid crystal panel, wherein the unit gain amplifier comprises:
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at least one differential input part for generating a voltage signal corresponding to an electric potential difference between a positive-phase input signal and a negative-phase input signal by using a differential pair configured from a pair of transistors; an output part for generating and outputting an output signal of a logic level corresponding to the voltage signal generated by the differential input part; at least one auxiliary current generator for detecting a sudden change in the positive-phase input signal or the negative-phase input signal and generating an auxiliary current; and a drive current generator for adding together a predetermined reference current and the auxiliary current and generating a drive current of the differential input part.
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7. A parameter setting circuit integrated in a semiconductor device and comprising:
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a first external terminal impressed with a fixed voltage, and a second external terminal connected to the first external terminal via an external resistor; and passing a current through the external resistor by impressing a predetermined reference voltage between the first external terminal and the second external terminal, and setting an internal parameter for the semiconductor device in accordance with the current. - View Dependent Claims (8, 9, 10)
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11. A semiconductor device comprising:
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a first external terminal impressed with a fixed voltage; a second external terminal connected to the first external terminal via an external resistor; an overcurrent protection circuit for comparing a predetermined threshold voltage and a detected voltage whose voltage value varies in accordance with a magnitude of a monitored current, and generating an overcurrent protection signal; and a parameter setting circuit for outputting the threshold voltage; wherein the parameter setting circuit passes a current through the external resistor by impressing a predetermined reference voltage between the first external terminal and the second external terminal, and sets the threshold voltage in accordance with the current. - View Dependent Claims (12)
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13. A power supply unit comprising:
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a semiconductor device; and a switching element for generating a desired output voltage from an input voltage due to performance of on/off control by the semiconductor device; wherein the semiconductor device has the following components; a first external terminal impressed with a fixed voltage; a second external terminal connected to the first external terminal via an external resistor; an overcurrent protection circuit for comparing a predetermined threshold voltage and a detected voltage whose voltage value varies in accordance with a magnitude of a monitored current, and generating an overcurrent protection signal; a switch drive circuit provided with a shut-down function based on the overcurrent protection signal; and a parameter setting circuit for outputting the threshold voltage; and wherein the parameter setting circuit passes a current through the external resistor by impressing a predetermined reference voltage between the first external terminal and the second external terminal, and sets the threshold voltage in accordance with the current.
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14. A liquid crystal drive device comprising:
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a unit gain amplifier provided in a signal path to a liquid crystal display panel; and a power supply circuit for generating a desired output voltage from an input voltage and supplying electrical power to the unit gain amplifier; wherein the unit gain amplifier has the following components; at least one differential input part for generating a voltage signal corresponding to an electric potential difference between a positive-phase input signal and a negative-phase input signal by using a differential pair configured from a pair of transistors; an output part for generating and outputting an output signal of a logic level corresponding to the voltage signal generated by the differential input part; at least one auxiliary current generator for detecting a sudden change in the positive-phase input signal or the negative-phase input signal and generating an auxiliary current; and a drive current generator for adding together a predetermined reference current and the auxiliary current and generating a drive current of the differential input part; wherein the semiconductor device comprises; a first external terminal impressed with a fixed voltage; and a second external terminal connected to the first external terminal via an external resistor; and wherein the power supply circuit comprises; an overcurrent protection circuit for generating an overcurrent protection signal showing whether a monitored current is in an overcurrent state; and an overcurrent protection value setting circuit for passing a current through the external resistor by impressing a predetermined reference voltage between the first external terminal and the second external terminal, and setting an overcurrent protection value for the overcurrent protection circuit in accordance with the current. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification