Temperature detector providing multiple detected temperature points using single branch and method of detecting shifted temperature
First Claim
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1. A temperature detector detecting a temperature shifted from a set target temperature, comprising:
- an automatic pulse generator adapted to sequentially generate temperature control signals in response to a temperature detection signal;
a comparator adapted to compare detected temperatures with a reference temperature in response to the temperature control signals; and
a temperature detection controller adapted to selectively short-circuit a plurality of serially connected resistors using switching transistors in response to the temperature control signals to provide the detected temperatures, the temperature detection controller being connected in a single branch.
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Abstract
A temperature detector and method of detecting a shifted temperature provides multiple detected temperature points using a single branch. The temperature detector generates multiple detected temperature points in response to temperature control signals sequentially generated in a single branch. Since a shifted temperature for the single branch is found and a trimming operation in response to the shifted temperature is carried out, the test time is reduced. Various refresh periods can be set in response to various trip point temperatures and thus power consumption of a DRAM can be decreased.
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Citations
22 Claims
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1. A temperature detector detecting a temperature shifted from a set target temperature, comprising:
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an automatic pulse generator adapted to sequentially generate temperature control signals in response to a temperature detection signal; a comparator adapted to compare detected temperatures with a reference temperature in response to the temperature control signals; and a temperature detection controller adapted to selectively short-circuit a plurality of serially connected resistors using switching transistors in response to the temperature control signals to provide the detected temperatures, the temperature detection controller being connected in a single branch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A temperature detector detecting a temperature shifted from a set target temperature, comprising:
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an automatic pulse generator adapted to sequentially generate temperature control signals in response to a temperature detection signal; a comparator adapted to compare detected temperatures with a predetermined reference temperature in response to the temperature control signals; a trip temperature increasing part comprising first short-circuiting switching transistors adapted to selectively short-circuit a plurality of serially connected first binary weighted resistors in response to first test input signals and to increase the detected temperature when the shifted temperature is lower than the target temperature, the trip temperature increasing part being connected in a single branch; a trip temperature decreasing part comprising second short-circuiting switching transistors adapted to selectively short-circuit a plurality of serially connected second binary weighted resistors in response to second test input signals and to decrease the detected temperature when the shifted temperature is higher than the target temperature, the trip temperature decreasing part being connected in the single branch; and a temperature detection controller adapted to selectively short-circuit a plurality of serially connected resistors using third switching transistors in response to the temperature control signals to provide the detected temperatures, the temperature detection controller being connected to the single branch. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of detecting a temperature shifted from a set target temperature, comprising:
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sequentially generating temperature control signals in response to a temperature detection signal; selectively short-circuiting a plurality of serially connected resistors using switching transistors in response to the temperature control signals to provide detected temperatures, the switching transistors are being connected in a single branch; and comparing the detected temperatures with a predetermined reference temperature in response to the temperature control signals to determine the shifted temperature. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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Specification