Reference voltage source, temperature sensor, temperature threshold detector, chip and corresponding system
First Claim
1. A bandgap electrical reference voltage source (104) comprising:
- a first electrical current source (PTAT 101) adapted to produce a first current (14) proportional to a temperature within an operating range of the source; and
a second electrical current source (CPTAT 102) adapted to produce a second current (15) inversely proportional to the temperature;
characterised in that the first and second current sources are installed in parallel, and in that the voltage source comprises means (R3) of summating the first and second currents producing a reference current in the summation means generating the reference voltage (VREF) at the terminals of the summation means;
wherein the first current source comprises;
first current generation means adapted to produce at least one third current (I1, I2) proportional to the temperature; and
a first current mirror adapted to produce the first current (I4) as a function of the at least one third current (I1, I2); and
wherein the first current generation means comprises;
at least one first operational amplifier (A1) and at least one transistor (M1, M2) adapted to produce the at least one third current;
at least one bias resistance (R1) adapted to adjust the amplitude of the at least one third current; and
at least two bipole transistors (Q1, Q2) coupled together such that the voltages between the base and the emitter of the transistors are related through an equation of the diode junction type dependent on the temperature.
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Abstract
The invention relates to an electrical reference voltage source comprising: a first electrical current source (PTAT 101) adapted to produce a first current (14) proportional to a temperature; and a second electrical current source (CPTAT 102) adapted to produce a second current (15) inversely proportional to the temperature. According to the invention, the first and second current sources are installed in parallel and the voltage source comprises means (R3) of summating the first and second currents producing a reference current in the summation means generating the reference voltage (VREF) at the terminals of the summation means. The invention also relates to a temperature sensor, a temperature threshold detector, a chip and a corresponding system.
80 Citations
23 Claims
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1. A bandgap electrical reference voltage source (104) comprising:
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a first electrical current source (PTAT 101) adapted to produce a first current (14) proportional to a temperature within an operating range of the source; and
a second electrical current source (CPTAT 102) adapted to produce a second current (15) inversely proportional to the temperature;
characterised in that the first and second current sources are installed in parallel, and in that the voltage source comprises means (R3) of summating the first and second currents producing a reference current in the summation means generating the reference voltage (VREF) at the terminals of the summation means;
wherein the first current source comprises;
first current generation means adapted to produce at least one third current (I1, I2) proportional to the temperature; and
a first current mirror adapted to produce the first current (I4) as a function of the at least one third current (I1, I2); and
wherein the first current generation means comprises;
at least one first operational amplifier (A1) and at least one transistor (M1, M2) adapted to produce the at least one third current;
at least one bias resistance (R1) adapted to adjust the amplitude of the at least one third current; and
at least two bipole transistors (Q1, Q2) coupled together such that the voltages between the base and the emitter of the transistors are related through an equation of the diode junction type dependent on the temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A bandgap electrical reference voltage source (104) comprising:
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a first electrical current source (PTAT 101) adapted to produce a first current (I4) proportional to a temperature within an operating range of the source; and
a second electrical current source (CPTAT 102) adapted to produce a second current (I5) inversely proportional to the temperature;
characterised in that the first and second current sources are installed in parallel, and in that the voltage source comprises means (R3) of summating the first and second currents producing a reference current in the summation means generating the reference voltage (VREF) at the terminals of the summation means;
wherein the second current source comprises;
second current generation means adapted to produce at least one sixth current (I3) inversely proportional to the temperature; and
a second current mirror adapted to produce the second current (I5) as a function of the at least one sixth current; and
wherein the second current generation means comprise;
at least one second operational amplifier (A2) and at least one transistor (M5) adapted to produce the at least one sixth current; and
at least one bias resistance (R2) adapted to adjust the amplitude of the at least one sixth current. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification