5:1 Multiplexer Using a One-Fifth Duty Cycle Clock
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Solution Overview
Problem
Current high-speed networking environments lack a 5:1 multiplexer capable of operating at high data rates, such as 50 GHz, necessitating inefficient solutions like cascaded multiplexers or parallel transmission, which are not optimal for high-time-division-multiplexed signals.
Innovation Solution
A 5:1 multiplexer is developed using a ⅕th ratio duty cycle clock, combined with delays and phase shifters, allowing the use of AND and OR gates to create a serial data sequence from five channels, utilizing a single reference clock and enabling integration into an ASIC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple cascaded multiplexers with several clocks are used to achieve 100 GbE, then the multiplexing function is achieved, but the system complexity and number of components increase
Solution Approach 1:
The invention segments the clock signal into five distinct phase-shifted clocks derived from a single reference clock using a 1/5th duty cycle clock and phase shifters. This allows one multiplexer to handle all five channels independently, avoiding the need for cascaded multiplexers while maintaining high data rate capability.
Solution Approach 2:
A single 5:1 multiplexer performs the function that would otherwise require multiple multiplexers. The device universally handles five different input channels simultaneously, achieving 100 GbE capability without requiring cascaded configurations of multiple multiplexers.
2Productivity
If five 20 Gb/s signals are transmitted in parallel, then the transmission capacity is achieved, but the number of transmitters and receivers increases
Solution Approach 1:
The invention merges five separate 20 Gb/s channels into a single 100 Gb/s serial stream using time-division multiplexing. This combining approach allows transmission of equivalent capacity through a single transmitter and receiver pair, reducing component quantity while maintaining transmission capacity.
Solution Approach 2:
The multiplexer uses periodic time-division multiplexing with five distinct time slots, each carrying one of the input channels. The 1/5th duty cycle clock creates periodic enabling signals that sequentially activate each channel, achieving high-capacity transmission through time-based sharing of a single transmission path.
3Adaptability or versatility
If 4:1 and 2:1 multiplexers are combined to create a 5:1 multiplexer, then the 5:1 functionality is achieved, but three clock gating operations are required which is challenging
Solution Approach 1:
The invention uses dynamic phase shifting of a single clock signal to create five distinct timing references. Instead of statically gating multiple clocks, the system dynamically generates the necessary timing signals through phase rotation, reducing the complexity of clock management while achieving the same 5:1 multiplexing functionality.
Data Source
AI summary
The present invention provides methods and systems for multiplexing five channels, such as 10 Gb/s to 50 Gb/s, into a single data sequence using a 5:1 multiplexer using a ⅕th ratio duty cycle clock. The ⅕th ratio duty cycle clock is a clock with a period equal to the channel data rate, and a pulse width equal to the period of data rate five times higher. The ⅕th ratio duty clock is combined with a proper combination of delays and phase shifters to allow the use of AND gates and OR gates to combine the five channels in a proper sequence to create a serial five-times higher data sequence.