Common-Mode Serializer Output Stage for High-Speed TX Data Rates
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Solution Overview
Problem
Existing transmitter systems face speed limitations in their serialization stages, particularly the last multiplexer stage, which cannot meet the high data rate requirements of cutting-edge communication systems, leading to performance issues and reliability concerns.
Innovation Solution
A high-speed transmitter system is designed with a common mode controlled serialization stage embedded in the output stage, utilizing NMOS transistors and deriving the logic circuit's ground from the analog circuit's common mode to activate the NMOS gm stage quickly, reducing activation time and increasing data processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a chain of multiplexers is used for serialization, then parallel data can be converted to serial data, but the last multiplexer stage has significant speed limitation and cannot satisfy high data rate requirements
Solution Approach 1:
The patent divides the serialization function into multiple independent parallel paths, each handling a portion of the data. Instead of using a single chain of multiplexers where the last stage becomes a bottleneck, the system segments the data into parallel streams that are processed simultaneously and then combined, eliminating the speed limitation of sequential multiplexing stages.
Solution Approach 2:
The patent transitions from a one-dimensional sequential multiplexer chain to a multi-dimensional parallel processing architecture. By adding temporal and spatial dimensions through parallel paths and time-interleaved processing, the system achieves higher effective data rates without increasing the complexity of individual stages.
2Loss of time
If the logic circuit ground is derived from the analog circuit's common mode, then the NMOS gm stage activation time is reduced, but the circuit design becomes more complex
Solution Approach 1:
The patent merges the logic circuit ground reference with the analog circuit's common mode voltage. By combining these two previously separate reference systems into a unified structure, the patent eliminates the time delay associated with ground switching while maintaining circuit functionality. This integration allows the NMOS gm stage to activate faster without requiring completely separate ground systems.
Solution Approach 2:
The patent introduces a common mode voltage as an intermediary between the logic circuit and the analog circuit. This intermediary provides a stable reference that enables faster switching of the NMOS gm stage while maintaining signal integrity, acting as a mediator that resolves the conflict between speed requirements and circuit stability.
Data Source
AI summary
A high-speed transmitter system using a common mode controlled serialization stage embedded in an output stage is disclosed. In some embodiments, the transmitter includes a serialization circuit that is configured to convert parallel data into serial data with one or more serialization stages; a logic circuit that is configured to connect each input of a last stage of the one or more serialization stages of the serialization circuit, via a respective logic function, to a respective dedicated output stage of an output circuit; and the output circuit that is configured to implement output stages to generate a signal based on the received input using NMOS transistors. In addition, the logic circuit is configured to be a desired voltage value (e.g., the output circuit's common mode) such that a switching point of the NMOS gm stage can be decreased and the gm stage can be activated within a reduced time.