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A Digital Temperature Sensor Circuit Based on Resistive Oscillator

A sensor circuit, digital temperature technology, applied in the direction of power oscillators, electrical components, etc., can solve the problem of not being able to form a ring oscillator, achieve high linearity and reduce power consumption

Active Publication Date: 2022-03-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

An even number of inverters cannot form a ring oscillator because the output behaves the same as the input

Method used

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  • A Digital Temperature Sensor Circuit Based on Resistive Oscillator
  • A Digital Temperature Sensor Circuit Based on Resistive Oscillator
  • A Digital Temperature Sensor Circuit Based on Resistive Oscillator

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Embodiment Construction

[0054] The digital temperature sensor circuit based on the resistive oscillator VCO proposed by the present invention is described in detail as follows in conjunction with the accompanying drawings and embodiments:

[0055] The present invention proposes a digital temperature sensor circuit based on a resistive oscillator, such as Figure 4 As shown, 401 is the main circuit module of the digital temperature sensor, including the first oscillator VCO1, the second oscillator VCO2, the first frequency divider, the second frequency divider, the first counter, the second counter, the subtractor and the temperature correction module.

[0056] The first oscillator VCO1 is used to generate the clock signal clk1, including N first delay units, N is a positive odd number, the output end of each first delay unit is connected to the input end of the next first delay unit, and the last The output terminal of the first delay unit is connected to the input terminal of the first first delay ...

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Abstract

A digital temperature sensor circuit based on a resistive oscillator belongs to the technical field of digital analog integrated circuits. In the present invention, N first delay units are connected end to end to form a delay chain to generate the first oscillator output, and N second delay units are connected end to end to form a delay chain to generate the second oscillator output. N is a positive odd number, and the first The second delay unit includes a first delay unit connected in series with a first resistor with better temperature linearity than the first delay unit; then use a frequency divider and a counter to obtain the period of the first oscillator output signal and the second oscillation The period of the output signal of the oscillator is used, and the temperature information is obtained according to the period difference between the output signal of the first oscillator and the output signal of the second oscillator. Under the condition of low power supply voltage power supply, the power consumption of the digital temperature sensor is reduced, and the high linearity of the digital temperature sensor is realized.

Description

technical field [0001] The invention belongs to the technical field of digital analog integrated circuits, in particular to a digital temperature sensor circuit based on a resistance oscillator. Background technique [0002] With the continuous shrinking of process size and the continuous reduction of power consumption, the power supply voltage is also continuously reduced, which brings great challenges to the design of analog circuits. The most direct impact of the power supply voltage drop is the drop of the internal signal swing of the circuit. In an analog circuit, the signal swing determines the dynamic range of the circuit. [0003] Nowadays, temperature sensors are gradually developing in the direction of miniaturization, digitization, and intelligence, but the challenges in power consumption, cost, high precision, and sensitivity to power supply noise are also increasing. Due to the good compromise in speed, area, power consumption and precision, the digital tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/04H03B5/20
CPCH03B5/04H03B5/20
Inventor 李靖储敬雅田明陈昱桦于奇宁宁
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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