High-sensitivity temperature detection integrated circuit

Abstract

The invention relates to a high-sensitivity temperature detection integrated circuit. The sources of a first PMOS transistor, a second PMOS transistor and a third PMOS transistor are all connected with a power supply voltage; the gates of the first PMOS transistor, the second PMOS transistor and the third PMOS transistor are all connected with a bias voltage Vb1; the drain of the first PMOS transistor is connected to the emitter of a first bipolar junction type transistor and the base of a second bipolar junction type transistor; the drain of the second PMOS transistor is connected with the emitter of the second bipolar junction type transistor and the base of a third bipolar junction type transistor; the drain of the third PMOS transistor constitutes a voltage output end Vt; the drain ofthe third PMOS transistor is further connected with the emitter of the third bipolar junction type transistor; and the base and collector of the first bipolar junction type transistor, and the collectors of the second bipolar junction type transistor and the third bipolar junction type transistor are grounded. With the high-sensitivity temperature detection integrated circuit of the invention adopted, a high-sensitivity temperature and voltage signal can be obtained in a wide temperature range; and the influence of thermal resistance change can be avoided. The structure of the circuit is simplified, and the area and manufacturing cost of the circuit are saved.

Description

technical field [0001] The invention relates to a temperature detection circuit. In particular, it relates to a high-sensitivity temperature detection integrated circuit. Background technique [0002] Temperature is one of the most common and important physical quantities in nature. From industry to scientific research, from food to medical treatment, the normal operation of various industries is inseparable from the detection and control of temperature. In recent years, online shopping has increasingly become a popular way of consumption, prompting the rapid development of the logistics industry. Among them, cold chain technology has become the most critical link to ensure the quality of goods transportation. For some fresh or more precious medical drugs, high-precision temperature detection accurate to a single piece is essential. In addition, smart wearable devices are gradually integrating high-precision body temperature detection technology. Integrated circuits hav...

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Problems solved by technology

[0004] However, the traditional temperature detection structure is often composed of separate devices, which occupies a large volume, complex structure, and poor compatibility. Therefore, a high-sensitivity temperature detection circuit using integrated circuit technology is proposed in this paper.

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