Unlock instant, AI-driven research and patent intelligence for your innovation.

A reference circuit whose steep change is proportional to absolute temperature

A reference circuit, absolute temperature technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as abnormal operation

Active Publication Date: 2018-01-30
CHONGQING GIGACHIP TECH CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PTAT of this design is very limited. Nowadays, high-precision analog circuits are particularly sensitive to bias current, and the magnitude of the current directly affects performance. After the PTAT voltage is converted into current, the current is large at high temperature, and the current is too small at low temperature, resulting in low temperature. not working properly

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A reference circuit whose steep change is proportional to absolute temperature
  • A reference circuit whose steep change is proportional to absolute temperature
  • A reference circuit whose steep change is proportional to absolute temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Concrete circuit diagram of the present invention is as Figure 4 The embodiment 1 circuit diagram of a reference circuit whose steep change is proportional to the absolute temperature is shown. It contains: the first resistor R 1 , the second resistor R 2 , the third resistor R 3 , the fourth resistor R 4 , the fifth resistor R 5 , the sixth resistor R 6 , the seventh resistor R 7 , the first PNP transistor Q 1 , the second PNP transistor Q 2 , the third PNP transistor Q 3 , the first inverter I 1 , the second inverter I 2 , NMOS tube N 1 , amplifier A 1 , where the first resistor R 1 One end is connected to the power supply, and the other end is connected to the second resistor R 2 One end and the first PNP transistor Q 1 the emitter, the second resistor R 2 The other end of the first PNP transistor Q 1 base of the first PNP transistor Q 1 The collector, the third resistor R 3 one end and the first inverter I 1 input terminal, the third resistor R ...

Embodiment 2

[0034] Concrete circuit diagram of the present invention is as Figure 5 A reference circuit whose steep change is proportional to the absolute temperature is shown in the circuit diagram of Embodiment 2. It contains: the first resistor R 1 , the second resistor R 2 , the third resistor R 3 , the fourth resistor R 4 , the fifth resistor R 5 , the sixth resistor R 6 , the first PNP transistor Q 1 , the second PNP transistor Q 2 , the third PNP transistor Q 3 , the first inverter I 1 , the second inverter I 2 , the third inverter I 3 , NMOS tube N 1 , amplifier A 1 , where the first resistor R 1 One end is connected to the power supply, and the other end is connected to the second resistor R 2 One end and the first PNP transistor Q 1 the emitter, the second resistor R 2 The other end of the first PNP transistor Q 1 base of the first PNP transistor Q 1 The collector, the third resistor R 3 one end and the first inverter I 1 input terminal, the third resistor R...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a reference circuit with direct proportion of the abrupt change temperature to the absolute temperature. The reference circuit comprises a triode Q2, a triode Q3, a resistor R4, a resistor R5, a resistor R6 and an amplifier, wherein the resistor R4 and the resistor R5 are respectively connected with the amplifier A1, the resistor R5 is connected with the amplifier A1, the resistor R4 is connected with the triode Q2, a base electrode and a collector electrode of the triode Q2 are grounded, the resistor R6 is connected with the triode Q3 and the amplifier A1, a base electrode and a collector electrode of the triode Q3 are grounded, the resistor R6 is connected with the amplifier A1, and the output of the reference circuit is changed by increasing the specific value of the resistor R5 and the resistor 4. The characteristic that the VBE voltage of the triode decreases with the increase of the temperature is utilized, a transistor at the normal temperature or low temperature is turned on through the voltage, the output voltage of the reference circuit is designed to be a zero-temperature coefficient voltage, the voltage is utilized to turn off the transistor at the high temperature, the positive temperature characteristic exceeds the negative temperature characteristic, and then the output of the reference circuit is abruptly changed to a positive temperature curve.

Description

technical field [0001] The invention relates to its application and the field of analog-to-digital / digital-to-analog converters, in particular to a steeply changing positive temperature coefficient reference circuit, which provides a reference circuit that only changes at high temperatures and is proportional to the absolute temperature. Background technique [0002] Conventional reference circuits are designed for voltage output with zero temperature coefficient, figure 1 Shown is a conventional zero-temperature reference voltage generation circuit whose output voltage is: [0003] [0004] where V BE2 is the PNP transistor Q 2 The BE pole voltage. V T =kT / q, k is the Boltzmann constant, T is the absolute temperature, q is the electric quantity of electrons, n is Q 2 The total emitter area ratio on Q 3 The total area of ​​the emitter. The reference voltage with zero temperature coefficient is designed as (1+R 5 / R 4 ) lnn ≈ 1.72. and V with negative temperature...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/567
CPCG05F1/567
Inventor 徐鸣远李梁秦煜森聂辉王育新付东兵陈光炳黄兴发沈晓峰陈玺
Owner CHONGQING GIGACHIP TECH CO LTD