Mixed-Signal Register Interface for Low-Wire Analog-Digital Links
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Solution Overview
Problem
Mixed signal systems, such as sensor chips, face challenges in reducing area and footprint due to the large number of wires and level shifters required for communication between digital and analog domains, as well as the use of multiplexers, which also impact timing constraints and functionality.
Innovation Solution
The solution involves moving addressable registers from the digital domain to the analog domain, using a selective interface to write data and gate outputs in a daisy chain configuration to reduce wire count and eliminate multiplexers, allowing efficient data transmission and read operations between domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital data is transmitted from the digital domain to the analog domain using traditional wires and level shifters, then data communication between domains is achieved, but the area and footprint of the system increase due to the large number of wires and level shifters required
Solution Approach 1:
Multiple control signals are merged into a single communication channel by encoding them as digital values. Instead of using separate wires for each control signal, the patent combines hundreds of control signals into a unified digital interface that transmits data serially between the digital and analog domains, dramatically reducing the number of wires and level shifters required.
Solution Approach 2:
An intermediary interface circuit is introduced between the digital and analog domains to enable efficient data transmission. This interface includes digital-to-analog converters and control logic that translate digital values into analog control signals, serving as a mediator that eliminates the need for direct wire connections between domains.
2Adaptability or versatility
If multiplexers are used to transmit data between the digital domain and the analog domain, then data routing flexibility is improved, but the area and footprint increase due to the large size of multiplexers
Solution Approach 1:
The patent replaces traditional mechanical multiplexer structures with a digital encoding scheme. Instead of using physical multiplexer switches to route signals, the system uses digital value encoding where control signals are represented as binary values that can be transmitted through a single channel and decoded at the destination, eliminating the need for large multiplexer circuits.
3Ease of operation
If hundreds of control signals are driven from the digital domain to the analog domain to trim the sensor chip, then precise control and tuning functionality is achieved, but the number of wires and level shifters increases significantly
Solution Approach 1:
A single digital interface circuit is designed to perform multiple functions: it can transmit any control signal to any analog block, read back status information, and configure different parts of the sensor chip. This universal interface replaces hundreds of dedicated control lines, providing the same control flexibility with dramatically reduced hardware complexity.
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
This approach reduces the number of wires and level shifters, eliminates the need for multiplexers, and enables efficient data read from the analog to the digital domain without sacrificing timing constraints or functionality, thereby minimizing the system's area and footprint.
Implementation Method 1
The interface is configured to write data to an addressable register within a BAR of the plurality of BARs in the analog domain by transmitting a first select signal configured to select a first BAR of the plurality of BARs
Implementation Method 2
the interface is further configured to broadcast the write data to the first BAR and further to at least one BAR other than the first BAR of the plurality of BARs
Implementation Method 3
The analog domain is configured to transmit data from a second BAR of the plurality of BARs to the digital domain by gating a select BAR signal associated with each BAR of the plurality of BARs with its corresponding content stored therein to form a respective BAR output
Implementation Method 4
at least one logical OR gate is used to gate the respective BAR outputs
Implementation Method 5
A select BAR signal associated with each BAR of the plurality of BARs and its corresponding content stored therein are AND gate together
Implementation Method 6
The system may further include a level shifter configured to change voltages between the digital and analog domains
Data Source
AI summary
A mixed signal system includes a digital domain and an analog domain. The analog domain includes a plurality of BARs. Each BAR includes addressable registers. The digital domain includes an interface configured to communicate with the analog domain, e.g., write data to an addressable register within a BAR by transmitting a first select signal to select a first BAR of the plurality of BARs. The interface transmits an address of the addressable register of the first BAR and broadcasts the write data to the first BAR and at least one BAR other than the first BAR. The analog domain transmits data from a second BAR of the plurality of BARs to the digital domain by gating a select BAR signal associated with each BAR with its corresponding content stored therein to form respective BAR output and further by gating the respective BAR outputs with one another.