Voltage Driver Modulation for HART Protocol ASIC Integration
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Solution Overview
Problem
Implementing the HART protocol on an ASIC chip is challenging due to the reliance on large, discrete components, which is impractical for a solid-state design, as it requires modulating terminal voltage while maintaining current flow without using transformers.
Innovation Solution
An integrated circuit with a voltage driver that modulates voltage across terminals while monitoring current flow, using a current sensing resistor and differential amplifier to generate signals for processing, and a summing circuit to modulate terminal voltage without altering the current, allowing for HART communication without transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transformer is used to modulate voltage while maintaining current flow, then voltage modulation capability is achieved, but device size and complexity increase making it impractical for ASIC integration
Solution Approach 1:
The patent replaces the mechanical/electromagnetic transformer system with an electronic circuit implementation using operational amplifiers, transistors, and resistors. The voltage modulation function previously requiring a physical transformer is now achieved through electronic signal processing components that can be integrated on an ASIC chip, eliminating the need for discrete transformer components.
Solution Approach 2:
The patent combines multiple functions (voltage modulation, current sensing, and signal processing) into a single integrated circuit block. The operational amplifier-based voltage driver integrates the voltage control function with the current sensing feedback mechanism, merging what would traditionally be separate discrete components into one unified ASIC-integratable unit.
2Volume of moving object
If a transformer is used for voltage modulation, then voltage control is achieved, but the discrete component size prevents solid-state ASIC design
Solution Approach 1:
The patent substitutes the bulky transformer-based voltage modulation system with a compact electronic circuit using operational amplifiers and transistors. This replacement dramatically reduces the circuit footprint from discrete component size to integrated circuit scale while maintaining the voltage modulation functionality through electronic feedback control.
Solution Approach 2:
The patent changes the operating parameters and control mechanism from transformer-based electromagnetic induction to operational amplifier-based electronic voltage control. By using the op-amp's high gain and feedback capabilities, the system achieves precise voltage modulation with much smaller component values, enabling ASIC integration.
3Adaptability or versatility
If discrete components are used for HART communication, then voltage modulation is possible, but integration onto ASIC chip is prevented
Solution Approach 1:
The patent merges the HART protocol implementation functions into a single integrated circuit block that includes the voltage driver, current sensor, and signal processing components. This consolidation allows the complete HART communication capability to be fabricated as a monolithic ASIC, eliminating the need for assembling multiple discrete components while maintaining full protocol compliance.
Solution Approach 2:
The integrated circuit is designed to perform multiple functions required by the HART protocol: voltage modulation for signal transmission, current sensing for loop monitoring, and signal conditioning for communication. This multi-functional integration enables a single ASIC to replace what would traditionally require multiple discrete components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables HART protocol implementation on an ASIC chip by maintaining current flow while modulating voltage, facilitating efficient communication without the need for transformers, thus overcoming the limitations of discrete components in solid-state designs.
Implementation Method 1
a resistor designed to form a voltage across its terminals in relation to a current flowing through a current loop
Implementation Method 2
a differential amplifier designed to generate a signal in relation to the voltage formed by the resistor
Data Source
AI summary
Systems for communicating over a communication interface are provided. An integrated circuit includes circuitry for monitoring a current flowing between two terminals of the integrated circuit. The integrated circuit also includes a voltage driver circuit for modulating a voltage between two terminals of the integrated circuit. The voltage driver modulates the voltage across the two terminals of the integrated circuit to encode data according to the Highway Addressable Remote Transducer protocol.