8x Time-Interleaved Pre-DAC Multiplexer for SERDES Power Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current SERDES systems face power consumption and bandwidth limitations due to the use of multiple multiplexer slices and the dependency on high-frequency clock selection for clock alignment, particularly in higher Nyquist frequency operations.
Innovation Solution
Implementing an 8× time-interleaved pre-DAC structure with specially designed 1 UI resets and a 2-to-1 MUX that does not require CK2 clock selection, using an 8-to-1 MUX function with two 4-to-1 MUX stages and a final 2-to-1 MUX to achieve high bandwidth without high-frequency clock generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple multiplexer slices are used for clock distribution in SERDES systems, then data transmission capability is improved, but power consumption increases substantially
Solution Approach 1:
The patent divides the data transmission system into multiple parallel lanes, each handling a portion of the total data rate. By segmenting the data stream across multiple lower-rate channels rather than using a single high-rate channel with complex multiplexing, the system achieves high productivity while reducing power consumption in each individual lane.
Solution Approach 2:
The patent transitions from a single-dimensional high-speed serial transmission approach to a multi-dimensional parallel transmission architecture. By adding the spatial dimension of multiple lanes and utilizing time-interleaved techniques, the system achieves high data rates without requiring proportionally high clock frequencies in each lane, thereby reducing power consumption.
2Speed
If high-frequency clock selection is used for clock alignment in higher Nyquist frequency operations, then bandwidth is improved, but device complexity and power usage increase
Solution Approach 1:
The patent implements dynamic clock selection and alignment mechanisms that adapt to different operating conditions. The system can dynamically adjust clock phases and frequencies based on the specific lane and data rate requirements, allowing high bandwidth operation without permanently complex clock alignment circuitry.
Solution Approach 2:
The patent changes the clocking parameters (frequency, phase, duty cycle) dynamically across different lanes and operating modes. By varying these parameters rather than using fixed high-frequency clocks throughout, the system achieves high bandwidth where needed while reducing complexity and power consumption in other areas.
3Productivity
If CK2 clock selection is used for final 2-to-1 MUX operation, then data rate is improved, but bandwidth is limited due to increased complexity at higher frequencies
Solution Approach 1:
The patent segments the data transmission into multiple parallel lanes that operate at lower individual data rates. By dividing the total data rate across multiple lanes rather than using a single high-rate channel with complex MUX operations, the system achieves high overall productivity while each lane operates within bandwidth-capable frequency ranges.
Solution Approach 2:
The patent adds spatial dimensionality by using multiple parallel transmission lanes instead of relying solely on temporal multiplexing at high frequencies. This dimensional transition allows the system to achieve high data rates through parallelism rather than through complex high-frequency clock selection and MUX operations.
Data Source
AI summary
Apparatus, systems, and methods for systems and methods for data signal multiplexing may be provided. According to an aspect a method for data signal multiplexing may be provided. The method includes interleaving, by a first 4-to-1 (4:1) multiplexer (MUX), a first set of four analog signals received from a first group of 4 Digital-to-Analog Converters (DACs) to generate a first interleaved analog output. The method may further include interleaving, by a second 4:1 MUX, a second set of four analog signals received from a second group of 4 DACs to generate a second interleaved analog output. Each of the first and the second interleaved analog output may be based on a first 8-unit interval (UI) window including four consecutive 2 UI windows. The method may further include interleaving, by a 2:1 MUX, the first interleaved analog output and the second interleaved analog output to generate a combined interleaved analog output.