Shared LC Filter in SERDES Transceivers for Noise and Emissions
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Solution Overview
Problem
SERDES transceivers face challenges in managing high-frequency emissions and external interference due to separate filters for transmit and receive modes, complicating design and increasing component count.
Innovation Solution
A transceiver with a shared LC filter for both transmit and receive modes, providing reciprocal frequency response and proper termination to minimize interference and external noise, using a single filter for both operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate filters are used for transmit and receive functions, then each function can be optimized independently, but device complexity and component count increase
Solution Approach 1:
The patent combines separate transmit and receive filters into a single shared filter structure. The filter is configured with a first port coupled to the transmitter and a second port coupled to the receiver, allowing both functions to share the same filtering components while maintaining independent operation through port coupling.
Solution Approach 2:
The shared filter is designed to perform multiple functions simultaneously - it filters transmit signals on the outbound path and receive signals on the inbound path. This universal filter structure eliminates the need for separate dedicated filters while maintaining signal integrity for both transmit and receive operations.
2Reliability
If separate filters are implemented for transmitter and receiver, then each can be optimized for its specific function, but manufacturing cost and component count increase
Solution Approach 1:
The patent merges multiple filter functions into a single physical filter structure, reducing the total component count. The shared filter uses common filtering elements for both transmit and receive paths, simplifying the bill of materials and manufacturing processes while maintaining effective noise filtering.
Solution Approach 2:
The universal filter design allows a single component to serve multiple purposes - filtering outgoing transmit signals and incoming receive signals. This multi-functionality reduces manufacturing complexity and component procurement costs while maintaining the reliability needed for high-speed SERDES communications.
3Speed
If high-speed serial links are used for communication, then data transmission rate increases, but high frequency emissions and external interference increase
Solution Approach 1:
The patent applies filtering that converts the harmful high-frequency noise and interference into beneficial signal conditioning. The shared filter is designed to pass the desired high-speed serial data while attenuating harmful high-frequency emissions and external interference, effectively converting the challenge of high-speed signaling into an opportunity for selective frequency management.
Solution Approach 2:
The filter design changes the frequency domain parameters of the signals - allowing high-speed data transmission through while blocking harmful high-frequency emissions and external interference. By carefully selecting filter cutoff frequencies and characteristics, the system maintains high data rates while eliminating interfering frequencies.
4Speed
If high-speed serial links are used, then communication performance improves, but high frequency noise affects received data causing bit errors
Solution Approach 1:
The shared filter modifies the frequency parameters of received signals by attenuating high-frequency noise while preserving the high-speed serial data signal. This selective frequency filtering maintains data integrity by removing noise that would cause bit errors, allowing high communication rates without sacrificing reliability.
Solution Approach 2:
The filter converts harmful high-frequency noise into beneficial signal conditioning by selectively attenuating interfering frequencies while passing the desired high-speed data. This transforms the problem of high-frequency noise into an opportunity for improved signal quality and reduced bit error rates.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Simplifies design, reduces component count, and effectively manages interference and noise, ensuring consistent performance in both transmit and receive modes.
Implementation Method 1
The filter may further be an LC (inductive-capacitive filter) having one or more inductors and one or more capacitors
Implementation Method 2
The filter may further be an LC (inductive-capacitive filter) having one or more inductors and one or more capacitors
Implementation Method 3
the filter provides resistive termination of the transmission line, and the inductors may chose such that their resistance values provide the desired termination
Data Source
AI summary
A transceiver having a shared filter for both transmit and receive modes is disclosed. A transceiver includes a transmitter having an output coupled to a signal node, wherein the transmitter is configured to transmit signals onto the signal node during transceiver operation in a transmit mode. The transceiver also includes a receiver having an input coupled to the signal node, and configured to receive signals from the signal node during operation in the receive mode. The transceiver further includes a first filter coupled to the signal node, wherein the filter is shared by the transmitter and the receiver. The filter is coupled between the transceiver and a first terminal of a transmission line.