US 6,747,486 B2Granted

Comparator

AssigneeInfineon Technologies AG

InventorWolfgang Horn

Life of this patent

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Abstract

A comparator includes an adjustable offset and particularly dimensioned and configured components. The particular configuration and dimensioning of the comparator ensure that the offset voltage can be set precisely and permanently to a value, which can vary within a large range. The setting of an offset voltage does not lead to the degradation of other properties of the comparator, in particular to a slower reaction to changes in the input voltages.

Claims14

Dependent claims

A comparator for generating an output signal in dependence on a size ratio of a first voltage and a second voltage, the comparator comprising:

control devices including a first control device and a second control device;
a resistor;
power sources including a first power source and a second power source;
said first control device having a first terminal, a second terminal, and a third terminal;
said second control device having a first terminal, a second terminal, a third terminal and a fourth terminal;
said first terminal of said first control device receiving the first voltage;
said second terminal of said first control device connected to said third terminal of said first control device, and to said second terminal of said second control device through said resistor;
said third terminal of said first control device connected to said first power source, and said third terminal of said first control device receiving a first current having a size depending on a difference between the voltage at said first terminal of said first control device and the voltage at said second terminal of said first control device;
said first terminal of said second control device receiving the second voltage;
said second terminal of said second control device connected to said fourth terminal of maid second control device;
said third terminal of said second control device connected to maid second power source, and receiving a second current having a size depending on a difference between the voltage at said first terminal of said second control device and the voltage at said second terminal of said second control device;
said third terminal of said second control device providing the output signal of said comparator to an output terminal;
and
said fourth terminal of said second control device receiving a third current having a size depending on the difference between the voltage at said first terminal of said second control device and the voltage at said second terminal of said second control device.

11 more elements

Dependencies are inferred from the claim text.

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Abstract

A comparator for generating an output signal in dependence on a size ratio of a first voltage and a second voltage, the comparator comprising:

control devices including a first control device and a second control device;
a resistor;
power sources including a first power source and a second power source;
said first control device having a first terminal, a second terminal, and a third terminal;
said second control device having a first terminal, a second terminal, a third terminal and a fourth terminal;
said first terminal of said first control device receiving the first voltage;
said second terminal of said first control device connected to said third terminal of said first control device, and to said second terminal of said second control device through said resistor;
said third terminal of said first control device connected to said first power source, and said third terminal of said first control device receiving a first current having a size depending on a difference between the voltage at said first terminal of said first control device and the voltage at said second terminal of said first control device;
said first terminal of said second control device receiving the second voltage;
said second terminal of said second control device connected to said fourth terminal of maid second control device;
said third terminal of said second control device connected to maid second power source, and receiving a second current having a size depending on a difference between the voltage at said first terminal of said second control device and the voltage at said second terminal of said second control device;
said third terminal of said second control device providing the output signal of said comparator to an output terminal;
and
said fourth terminal of said second control device receiving a third current having a size depending on the difference between the voltage at said first terminal of said second control device and the voltage at said second terminal of said second control device.

11 more elements