A Temperature-Independent Current Reference Source for Integrated Circuits
A current reference source and integrated circuit technology, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems that the low temperature coefficient cannot be met, and the traditional current reference source cannot meet the needs.
Inactive Publication Date: 2016-09-14
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology
Although the bandgap reference voltage V REF It has the advantages of being independent of process, voltage and temperature, but the output current is also affected by amplifier offset and resistance temperature characteristics, so the reference current generated by this structure cannot meet the characteristics of low temperature coefficient
In some high-end temperature-sensitive integrated circuit applications, these traditional current reference sources cannot meet their needs
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[0034] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0035] In the following embodiments, the first current generating circuit is named as a negative temperature coefficient current generating circuit, and the second current generating circuit is named as a positive temperature coefficient current generating circuit.
[0036] The temperature-independent current reference source provided by the present invention is as figure 2 shown, including: negative temperature coefficient current generation circuit I CTAT , Positive temperature coefficient current generating circuit I PTAT and the current summation circuit I TOTAL , and the connection relationship of each circuit is as follows figure 2 .
[0037] Such as image 3 As shown, the temperature-independent current reference source circuit in this embodiment includes: a negative temperature coefficient current generat...
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The invention provides a temperature-independent integrated circuit current reference. The integrated circuit current reference comprises a first current generating circuit, a second current generating circuit and a current summation circuit; the first current generating circuit is used for generating current with a negative temperature coefficient; the second current generating circuit is used for generating current with a positive temperature coefficient; the output end of the first current generating circuit is connected with an input end of the current summation circuit, the output end of the second current generating circuit is connected with the other input end of the current summation circuit, the current summation circuit is used for adding the current output from the first current generating circuit and the second current generating circuit according to a set proportion, and the output current obtained through the current summation circuit is the output current of the temperature-independent integrated circuit current reference.
Description
technical field [0001] The invention relates to the field of analog integrated circuit design, and more particularly relates to a temperature-independent integrated circuit current reference source realized by using current superposition technology. Background technique [0002] The current reference source is a commonly used module in analog integrated circuits, and is widely used in various analog integrated circuits and analog / mixed-signal integrated circuits, including data converters, switched capacitor circuits, monolithic image sensors, micro-electromechanical systems (MEMS) interface circuit, etc. [0003] Traditional temperature-independent current reference sources are converted to output current through a resistor on the basis of a voltage source, figure 1 It is a traditional temperature independent current reference source. This circuit converts the temperature-independent output voltage V from a bandgap reference through an operational amplifier and resistor ...
Claims
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IPC IPC(8): G05F3/26
Inventor 齐敏孙泉乔东海汤亮
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI