CN201434687Y - Circuit optimizing common mode electrical level and reducing power consumption of transducers - Google Patents
Circuit optimizing common mode electrical level and reducing power consumption of transducers Download PDFInfo
- Publication number
- CN201434687Y CN201434687Y CN2009201391204U CN200920139120U CN201434687Y CN 201434687 Y CN201434687 Y CN 201434687Y CN 2009201391204 U CN2009201391204 U CN 2009201391204U CN 200920139120 U CN200920139120 U CN 200920139120U CN 201434687 Y CN201434687 Y CN 201434687Y
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- China
- Prior art keywords
- sensor
- resistance
- power consumption
- common mode
- electrical level
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Measuring Fluid Pressure (AREA)
- Analogue/Digital Conversion (AREA)
Abstract
The utility model provides a circuit optimizing the common mode electrical level and reducing the power consumption of transducers, which relates to a circuit reducing the power consumption. The circuit optimizing the common mode electrical level and reducing the power consumption of the transducers can reduce the power consumption of a variable pressure transducer and can guarantee the common mode electrical level of the signal output end of the transducer to be matched with the common mode electrical level of the signal input end of an analogue/digital converter chip. The circuit is providedwith the variable pressure transducer, is connected with a resistance in series between the upper end of the variable pressure transducer and a power supply, is connected with a resistance in seriesbetween the lower end of the variable pressure transducer and the ground, the connecting point between the upper end of the variable pressure transducer and the upper resistance and the connecting point between the lower end of the variable pressure transducer and the lower resistance are respectively connected with the input port of the analogue/digital converter chip, namely the voltage of the connecting point between the upper end of the variable pressure transducer and the upper resistance and the voltage of the connecting point between the lower end of the variable pressure transducer andthe lower resistance are used as the input reference voltage of the analogue/digital converter chip.
Description
Technical field
The utility model relates to a kind of reduction power digital circuit, especially relates to a kind of circuit of optimizing the sensor common mode electrical level and reducing power consumption.
Background technology
Press to become sensor element normally directly is added in power supply and ground in existing operational version two ends, in order to reduce its power consumption, usual way is to reduce sensor power supply voltage VDD.But along with the reduction of supply voltage, the pairing common mode electrical level of sensor signal output terminal also will reduce thereupon.Because the signal output part of sensor is connected with the signal input part of analog to digital converter (ADC) chip, common mode electrical level between these two kinds of devices is coupling mutually, under existing processes and circuit requirements, the common mode input of analog to digital converter chip generally is difficult to accomplish very low, so realize that by reducing supply voltage there is defective in the mode that reduces pressure change sensor power consumption.
Summary of the invention
The purpose of this utility model is in order to overcome the existing deficiency of pressing change sensor power consumption mode to exist that realizes reducing by reduction voltage, provide a kind of can the reduction press to become the sensor power consumption, the optimization sensor common mode electrical level that the common mode electrical level that can also guarantee the sensor signal output terminal and the signal input part common mode electrical level of analog to digital converter (ADC) chip are complementary and the circuit of reduction power consumption.
The technical solution of the utility model is by at the simple device of the peripheral interpolation of sensor, realizes pressing the reduction that becomes the sensor power consumption, and guarantees that the common mode electrical level of sensor signal output terminal and the signal input part common mode electrical level of analog to digital converter chip are complementary.
The utility model is provided with and press becomes sensor, be connected in series resistance pressing to become between sensor upper end and the power supply, press be connected in series between change sensor lower end and the ground under resistance; Press to become the tie point of sensor upper end and last resistance and press and become the input port that sensor lower end and the tie point of following resistance connect the analog to digital converter chip respectively, promptly press the tie point voltage that becomes sensor upper end and last resistance and press the tie point voltage that becomes sensor lower end and following resistance input reference voltage as the analog to digital converter chip.
Under the situation of guaranteeing to press the signal input part common mode electrical level that becomes sensor signal output terminal common mode electrical level and analog to digital converter chip to be complementary, press the all-in resistance that becomes on the sensor branch road to increase, flow through and press the electric current of change sensor to reduce, according to power consumption calculation formula P=I
2* R press to become under the constant situation of sensor self resistance as can be known, and the electric current that flows through reduces that its power consumption is also corresponding to be reduced.
This shows, the utility model becomes sensor and the actual conditions of analog to digital converter chips incorporate when low-power consumption is used at pressing, the sensor link road is sealed in resistive element, reduce the electric current of sensor branch road, reduce the power consumption of sensor effectively, thereby reduced total system power consumption in actual use effectively.The input reference voltage of analog to digital converter chip is taken from and is pressed the tie point voltage that becomes sensor and resistance, guarantees that system has good temperature performance.In addition, the utility model technology has bigger setting range to sensor signal output terminal common mode electrical level, can guarantee that the level of itself and analog to digital converter chip mates mutually, does not have the limited situation of using.
Description of drawings
Fig. 1 is that the structure of the utility model embodiment is formed synoptic diagram.
Embodiment
Referring to Fig. 1, the utility model embodiment be connected in series resistance R1 press becoming between sensor 1 upper end and the power vd D, resistance R 2 under being connected in series between pressure change sensor 1 lower end and ground GND; Press the input reference voltage positive pole (Vrefp) of the connected node voltage of change sensor 1 upper end and last resistance R1, press the connected node voltage that becomes sensor 1 lower end and following resistance R 2 as the input reference voltage negative pole (Vrefn) that connects analog to digital converter chip 2 as analog to digital converter chip 2.Press the signal output part (among Fig. 1 be respectively S+ and S-) of two ends, the left and right sides that becomes sensor 1 into being connected to analog to digital converter chip 2.
The utility model can guarantee that the system temperature characteristic is good. Output signal common mode electrical level of press sensor 1 etc. in the present embodiment In 1/2 of supply voltage VDD. With realize that by reducing supply voltage the method that reduces the press sensor power consumption compares this reality With the novel reduction that not only realizes the press sensor power consumption, and solved by supply voltage reduce and the common mode electrical level that brings not Matching problem.
Claims (1)
1. circuit of optimizing the sensor common mode electrical level and reducing power consumption is characterized in that being provided with pressing and becomes sensor, be connected in series resistance pressing to become between sensor upper end and the power supply, press be connected in series between change sensor lower end and the ground under resistance; Press to become the tie point of sensor upper end and last resistance and press and become the input port that sensor lower end and the tie point of following resistance connect the analog to digital converter chip respectively, promptly press the tie point voltage that becomes sensor upper end and last resistance and press the tie point voltage that becomes sensor lower end and following resistance input reference voltage as the analog to digital converter chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201391204U CN201434687Y (en) | 2009-06-28 | 2009-06-28 | Circuit optimizing common mode electrical level and reducing power consumption of transducers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201391204U CN201434687Y (en) | 2009-06-28 | 2009-06-28 | Circuit optimizing common mode electrical level and reducing power consumption of transducers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201434687Y true CN201434687Y (en) | 2010-03-31 |
Family
ID=42053497
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201391204U Expired - Lifetime CN201434687Y (en) | 2009-06-28 | 2009-06-28 | Circuit optimizing common mode electrical level and reducing power consumption of transducers |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201434687Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965566A (en) * | 2021-02-22 | 2021-06-15 | 重庆湃芯创智微电子有限公司 | Temperature coefficient reduction circuit for zero-pressure differential output offset of high-precision pressure sensor |
-
2009
- 2009-06-28 CN CN2009201391204U patent/CN201434687Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112965566A (en) * | 2021-02-22 | 2021-06-15 | 重庆湃芯创智微电子有限公司 | Temperature coefficient reduction circuit for zero-pressure differential output offset of high-precision pressure sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100331 |
|
| CX01 | Expiry of patent term |