CMOS process integrated temperature sensor used for TEC-free infrared imaging system

Abstract

The invention discloses a CMOS process integrated temperature sensor for a TEC-free infrared imaging system, which includes a temperature detection circuit, a bias circuit and an output stage drive circuit; Basically irrelevant constant current and common grid bias voltage; the temperature detection circuit includes a current mirror composed of four PMOS transistors and a temperature detection core circuit composed of two triodes, and the triodes are connected into a diode form through the temperature detection circuit. The diode temperature characteristic obtains a negative temperature coefficient voltage. The output stage drive circuit includes four PMOS transistors and two NMOS transistors, the two PMOS transistors are cascode current mirrors, the other two NMOS transistors are input pair transistors, and the two NMOS transistors are load transistors, through the output stage drive circuit output the signal voltage. The circuit implementation complexity of the method proposed by the invention is low, and has high practical application value.

Description

technical field [0001] The invention relates to the field of analog integrated circuits, in particular to a small-area, low-power temperature sensor integrated in a chip that can be used in radio frequency and digital-analog mixed signal circuits, especially in infrared imaging systems. Background technique [0002] Temperature is one of the most common and basic industrial parameters in industrial production. It is one of the physical quantities most closely related to human life and work. It is also a physical quantity that is often encountered and must be accurately measured in various disciplines and engineering research and design. From industrial furnace temperature, ambient air temperature to human body temperature, from space, ocean to household appliances, temperature measurement is inseparable from various technical fields. Temperature measurement technology is also one of the fastest growing technologies with the widest range. Accurate temperature measurement Meas...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the traditional discrete component temperature sensor cannot meet the requirement of accurately detecting the substrate temperature of the detector chip in the non-TEC infrared imaging system, the present invention proposes a CMOS process integrated temperature sensor for the non-TEC infrared imaging system, which increases the output The load capacity of the stage increases the corresponding speed, saves the area, and reduces the overall power consumption of the circuit while ensuring the output drive capability

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