On-chip temperature sensor
A temperature sensor and operational amplifier technology, applied in the field of on-chip temperature sensors, can solve the problem of inconsistent output results of temperature sensors, and achieve the effect of eliminating process deviation, reducing low-frequency noise, and reducing noise.
Active Publication Date: 2015-08-05
SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT
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Problems solved by technology
[0013] In summary, it can be seen that the on-chip temperature sensor of the prior art has the problem of inconsistent output results, so it is necessary to propose improved technical means to solve this problem
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[0038] The implementation of the present invention is described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.
[0039] figure 2 It is a schematic circuit structure diagram of an on-chip temperature sensor of the present invention. Such as figure 2 As shown, an on-chip temperature sensor of the present invention includes at least a basic circuit, a clamping amplifier circuit 22 and a dynamic element matching control circuit 23 .
[0040] The basic circuit includes field effect transistors M1~M10, ...
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The invention discloses an on-chip temperature sensor. The sensor comprises a basic circuit, a clamp amplification circuit and a dynamic element matching control circuit, wherein the clamp amplification circuit is connected to the basic circuit and comprises a clamp operational amplifier and a voltage clamp control module; through the voltage clamp control module, the clamp of two input terminal voltages of the clamp operational amplifier can be realized so that the two input terminal voltages of the clamp operational amplifier work in the same voltage; the dynamic element matching control circuit is connected to the basic circuit and at least comprises a dynamic element matching controller and four current sources; the dynamic element matching controller generates eight control levels under the control of a third clock signal so as to control the four current sources; of all the four current sources, there is always one connected with an input negative voltage, and the other three are connected with an input positive voltage. By using the sensor of the invention, influence caused by a technology deviation can be radically eliminated so that mismatch can reach an average effect. Finally, results between the different chips can be consistent and simultaneously, noises can be reduced.
Description
technical field [0001] The invention relates to an on-chip temperature sensor, in particular to a high-precision on-chip temperature sensor. Background technique [0002] In modern life, the detection and monitoring of temperature information has always been the focus of attention, especially in areas related to people's daily life such as food, medical care, and hygiene. Therefore, products for temperature detection and control are widely used. At the same time, there are also a wide variety of temperature sensor products, such as thermocouples for off-chip temperature detection, and on-chip temperature sensors that use the temperature characteristics of the PN junction of the triode to achieve temperature detection. The off-chip temperature sensor is characterized by higher temperature accuracy, but because it is off-chip, the disadvantage is also obvious, that is, it takes up a larger area. At the same time, if the temperature inside the chip is detected, then off-chip se...
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IPC IPC(8): G01K7/00
Inventor 皮常明张远范红梅
Owner SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT