Adjustable FIR Transmitter Bypass Logic for Low-Latency Equalization
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Solution Overview
Problem
Modern electronic devices face latency issues when communicating data between processors, which impairs timely task completion and decreases throughput due to inefficiencies in serial data transmission over communication channels.
Innovation Solution
A finite impulse response (FIR) transmitter with adjustable latency and equalization capabilities, utilizing a plurality of delay elements and driver circuitry, along with bypass logic, to selectively filter and equalize output signals using preceding and succeeding bits of data, thereby reducing latency and power consumption based on performance metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted through multiple delay elements for equalization, then signal quality is improved, but latency increases
Solution Approach 1:
The transmitter dynamically adjusts the number of delay elements based on channel conditions. When channel quality is good, fewer delay elements are used reducing latency. When channel quality degrades, more delay elements are engaged to improve signal equalization. This dynamic adaptation resolves the contradiction between signal quality and latency.
Solution Approach 2:
The system changes the equalization parameter (number of delay elements) based on performance metrics. By monitoring channel conditions and adjusting the equalization depth, the system optimizes the trade-off between signal quality improvement and latency introduction, allowing adaptive parameter tuning to resolve the technical contradiction.
2Reliability
If FIR filtering is applied to equalize output signals, then signal integrity is improved, but power consumption increases
Solution Approach 1:
The transmitter applies partial equalization by selectively enabling only the necessary number of delay elements and FIR filter taps based on channel conditions. Instead of always applying full equalization, the system uses just enough filtering to achieve acceptable signal integrity, thereby reducing power consumption while maintaining adequate signal quality.
Solution Approach 2:
The equalization strength is dynamically adjusted based on channel performance metrics. When channels are good, minimal equalization is applied consuming less power. When channels degrade, equalization is increased to maintain signal integrity. This dynamic adjustment resolves the power consumption versus signal integrity contradiction.
3Productivity
If adjustable latency and equalization are implemented, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The transmitter is segmented into modular components including multiple delay elements, selectable FIR filter structures, and control logic that independently manages equalization parameters. This segmentation allows flexible configuration and adjustment of latency and equalization levels without requiring complete system redesign, thereby managing complexity while maintaining transmission efficiency.
Solution Approach 2:
The transmitter design uses universal building blocks (delay elements, FIR filter stages) that can be selectively configured for different equalization and latency requirements. The same hardware structures serve multiple functions depending on configuration, reducing overall device complexity compared to having dedicated circuits for each function while still achieving adjustable latency and equalization for improved transmission efficiency.
Data Source
AI summary
Apparatus and methods are provided for generating output signals representative of bits of serial data. A transmitter comprises a plurality of delay elements, driver circuitry, and bypass logic coupled between the plurality of delay elements and the driver circuitry. The plurality of delay elements delay serialized data, resulting in delayed serialized data, and the driver circuitry generates an output signal representative of a first bit of the delayed serialized data. The bypass logic is configured to selectively bypass one or more delay elements of the plurality of delay elements to provide the first bit of the delayed serialized data to the driver circuitry.