Bit Polarization Coding for Low-Noise Zero-Crossing Conversion
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Solution Overview
Problem
Conventional A/D and D/A converters induce significant digital noise due to simultaneous changes in multiple binary bits when an analog signal crosses 0V, particularly in applications with signals centered at 0V, leading to frequent deviations and increased noise currents.
Innovation Solution
The implementation of bit polarization format (BPF) coding, which inverts a portion of the digital code's bits to balance changes from 0s to 1s and vice versa, reducing the number of simultaneous bit state changes and thereby minimizing digital noise, using a BPF coder and decoder to modify and recover digital codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional digital coding is used in A/D and D/A converters, then accurate analog signal representation is achieved, but significant digital noise is induced when the analog signal crosses 0V due to simultaneous changes in multiple binary bits
Solution Approach 1:
The patent segments the bit changes by introducing dummy bits that split the original bits into two groups. When the analog signal crosses 0V, the dummy bits change state instead of all original bits changing simultaneously. This segmentation reduces the number of bits changing at once, thereby reducing digital noise while maintaining accurate analog signal representation.
2Object-generated harmful factors
If Gray Coding is used to reduce digital noise by allowing only one bit to change state, then digital noise is reduced, but complex circuitry is required for coding and decoding data
Solution Approach 1:
The patent applies local quality by introducing dummy bits at specific positions within the digital code structure. Rather than fundamentally changing the entire coding scheme like Gray Coding, the dummy bits are strategically placed to affect only the bit transition behavior during 0V crossings. This localized modification reduces digital noise without requiring complex circuitry throughout the entire system.
3Measurement precision
If multiple binary bits change state simultaneously when an analog signal crosses 0V, then accurate voltage representation is maintained, but noise current is induced on the circuit board
Solution Approach 1:
The patent introduces dummy bits as intermediary elements between the analog signal and the digital output. These dummy bits act as mediators that absorb the transition activity during 0V crossings, preventing the simultaneous switching of multiple original bits. The dummy bits change state instead, thereby reducing noise current while the original bits continue to represent the voltage accurately.
Data Source
AI summary
A method and system for converting a digital code. A digital signal is encoded to have a digital code having multiple binary bits. Substantially one half of the binary bits of the digital code is inverted to produce a modified digital code to reduce digital noise associated with the digital code.