TEMPERATURE DETECTION CIRCUIT AND METHOD OF ADJUSTING THE SAME
First Claim
1. A temperature detection circuit for generating a temperature detection signal indicating a temperature of a semiconductor, comprising:
- first and second diodes having respective p-n junctions independent from each other;
a first current path including a first variable voltage dividing resistor that is connected in series to the first diode and whose dividing resistance ratio is variable according to a first offset adjustment signal;
a second current path including a second variable voltage dividing resistor that is connected in series to the second diode and whose dividing resistance ratio is variable according to a second offset adjustment signal;
a reference voltage generation part that feeds back a differential voltage to each of the first and second current paths and outputs the differential voltage as a reference voltage, the differential voltage indicating a difference between a first divided voltage divided by the first variable voltage dividing resistor and a potential on the second current path; and
a temperature detection signal generation part that generates the temperature detection signal on the basis of a second divided voltage divided by the second variable voltage dividing resistor.
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Accused Products
Abstract
A temperature detection circuit that can detect temperature with high accuracy regardless of manufacturing variations, and a method of adjusting the same. The circuit includes: first and second diodes having respective independent p-n junctions; a first current path including a first variable voltage dividing resistor series connected to the first diode; a second current path including a second variable voltage dividing resistor series connected to the second diode; a reference voltage generation part that feeds back a differential voltage to each of the first and second current paths and outputs as a reference voltage the differential voltage indicating a difference between a first divided voltage of the first variable voltage dividing resistor and a potential on the second current path; and a temperature detection signal generation part generating a temperature detection signal based on a second divided voltage of the second variable voltage dividing resistor.
24 Citations
11 Claims
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1. A temperature detection circuit for generating a temperature detection signal indicating a temperature of a semiconductor, comprising:
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first and second diodes having respective p-n junctions independent from each other; a first current path including a first variable voltage dividing resistor that is connected in series to the first diode and whose dividing resistance ratio is variable according to a first offset adjustment signal; a second current path including a second variable voltage dividing resistor that is connected in series to the second diode and whose dividing resistance ratio is variable according to a second offset adjustment signal; a reference voltage generation part that feeds back a differential voltage to each of the first and second current paths and outputs the differential voltage as a reference voltage, the differential voltage indicating a difference between a first divided voltage divided by the first variable voltage dividing resistor and a potential on the second current path; and a temperature detection signal generation part that generates the temperature detection signal on the basis of a second divided voltage divided by the second variable voltage dividing resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification