Temperature sensor based on delay unit

Abstract

The invention discloses a temperature sensor based on a delay unit, which comprises a temperature sensing module and a quantification module, and is characterized in that a pulse signal is input intothe temperature sensing module, one path outputs a direct signal, and the other path outputs a delay signal through a multi-stage delay unit; the quantization module comprises multiple stages of quantization units and an adder, the direct signal is input into one end of the quantization module, the delay signal is input into the other end of the quantization module, and a digital temperature signal is output; each stage of quantization unit comprises a differential delay unit and a latch; the output of the differential delay unit is respectively connected with two input ends of the latch, andthe output of the latch is connected with the adder. According to the temperature sensing module based on the multi-stage delay unit and the quantization module based on the differential delay unit, the current temperature is sensed through multi-stage quantization of the delay difference by the differential delay unit according to different transmission delays of the delay unit at different temperatures and different transmission delay differences of the differential delay unit; and on the premise of ensuring low power consumption, the induction speed of the temperature sensor is improved.

Description

technical field [0001] The invention belongs to the field of digital-analog hybrid integrated circuits, in particular to a temperature sensor based on a delay unit. Background technique [0002] As one of the sensors with the largest demand in the early stage of use, the temperature sensor provides temperature information for various measurement circuits and temperature compensation circuits. In recent years, the rapid popularization of Bluetooth, WI-FI, GPS, 5G and other communication methods has promoted the development and application of portable wireless communication devices, and put forward higher requirements for accurate clock signals and system power consumption levels. The commonly used crystal oscillator-based clock signal chip, the output frequency changes continuously with the temperature during operation. In order to maintain better clock accuracy, a temperature sensor is required to quickly compensate for the temperature in the clock source under low power con...

AI Technical Summary

Problems solved by technology

Another type of temperature sensor is based on a ring oscillator design. This type of temperature sensor has a significant advantage in chip area, but its measurement speed is greatly affected by its oscillation frequency

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