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Multiple die industrial process control transmitter

A transmitter and chip technology, applied in program control, digital control, computer control, etc., can solve problems such as power consumption, and achieve the effect of improving range, reducing operating power, and improving resolution

Inactive Publication Date: 2004-02-04
ROSEMOUNT INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the transmitter draws a maximum current of 3mA and consumes 10.7mW of power

Method used

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  • Multiple die industrial process control transmitter
  • Multiple die industrial process control transmitter
  • Multiple die industrial process control transmitter

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Embodiment Construction

[0021] The "range," or the ratio of maximum to minimum span, of an industrial process control transmitter is limited by the transmitter's resolution, which in turn is limited by the available power. It is desirable to be able to increase the amplitude variation range to reduce the manufacturing costs associated with the transmitter. The present invention achieves increased resolution by separating some of the transmitter's analog circuits from some of the digital circuits, and reallocating the power saved from the digital circuits to the analog circuits. With greater power on the analog circuitry, the resolution is improved, thereby increasing the amplitude variation range and reducing manufacturing costs.

[0022] figure 1 is a block diagram of a prior art two-wire industrial process control transmitter 10 . Transmitter 10 is coupled to a two-wire processing control loop 12 that carries current I. For example, loop 12 may be a 4-20 mA process control loop capable of operat...

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Abstract

A two-wire industrial process control transmitter includes a sensor (14), at least two integrated circuits (70, 72), and a level shift circuit (48). The first integrated circuit (70) contains the analog measurement circuit that includes a sensor detection circuit (16) and the analog portion (44) of a digital-to-analog convertor. The second integrated circuit (72) contains the digital system circuit that includes a modem (78) and the digital portion (46) of the analog-to-digital convertor. The first and second Ics may be powered at different voltage levels (Vdda, Vddd) to maximize the power of the analog circuit and improve resolution. Alternatively, the Ics may be powered at the same voltage level (Vddd), but the digital circuits are divided among several stacked dies (120, 122) to minimize the voltage for each digital circuit. In either case, the level shifting circuit (48) shifts the voltage level between the analog and digital circuits.

Description

technical field [0001] The present invention relates to the process control industry, in particular to second-wire industrial process control transmitters having improved resolution without increasing power requirements. Background technique [0002] An industrial process control transmitter is a transducer that responds to a process variable and provides a standard transmit signal as a function of the measured variable. The term "process variable" refers to a physical or chemical state of matter, or transformation of energy. Examples of process variables include pressure, temperature, flow, conductivity, pH, and other properties. Pressure can be considered a fundamental process variable since it can be used for measurement of flow (difference between two pressures), level (head or backpressure), and temperature (fluid pressure in thermal systems). Industrial Process Pressure Transmitters are used in industrial processes such as slurry, liquid, vapor, and gas processing in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08C19/02G05B19/042G05B19/414H04Q9/00
CPCG05B2219/34309G05B19/0423G05B2219/33197G05B2219/31126G05B19/4142G05B2219/31121
Inventor 韦斯顿·R·罗珀大卫·G·泰森布赖恩·L·韦斯特菲尔德迈克尔·J·加布瑞
Owner ROSEMOUNT INC
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