Two-Stage Serial Receiver Equalizer for 10 Gbps Signal Integrity
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Solution Overview
Problem
Existing circuitry faces challenges in receiving and processing high-speed serial data signals at rates above 10 Gbps, particularly in converting between serial and parallel forms efficiently, while minimizing noise amplification and maintaining low power consumption.
Innovation Solution
A two-stage, continuous-time, linear equalizer with programmable parameters is used to enhance signal reception, followed by half-rate bang-bang phase detector circuitry for deserialization and multi-stage demultiplexer/multiplexer circuitry for data conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional equalizer circuitry is used to receive high-speed serial data signals at 10 Gbps and higher, then the circuitry can support the data rate, but the circuitry becomes overly complex and consumes excessive power
Solution Approach 1:
The equalizer circuitry is divided into two distinct stages: a first stage with a first zero in its transfer function and a second stage with a second zero. This segmentation allows each stage to handle specific aspects of signal equalization, reducing the overall complexity while maintaining the capability to support 10 Gbps and higher data rates
Solution Approach 2:
The locations of the zeros in the transfer function of each equalizer stage are made variable through programming. This allows the equalizer to adapt to different channel conditions and optimize performance without requiring complex hardware reconfiguration, thus supporting high data rates with manageable complexity
2Speed
If conventional equalizer circuitry is used to receive high-speed serial data signals at 10 Gbps and higher, then the circuitry can support the data rate, but power consumption increases significantly
Solution Approach 1:
By dividing the equalization function into two simpler stages rather than one complex stage, each stage can be implemented more efficiently with lower power consumption, while together they provide the necessary equalization for 10 Gbps and higher data rates
Solution Approach 2:
Programmable zero locations allow the equalizer to achieve optimal performance with minimal power consumption by adapting to channel conditions software-wise rather than requiring power-hungry hardware reconfiguration
3Reliability
If equalization is increased to support high data rates, then signal integrity improves, but noise amplification increases
Solution Approach 1:
Each equalizer stage is designed with specific zero locations that target particular frequency regions where signal degradation occurs. This localized approach allows equalization to be applied precisely where needed without unnecessarily amplifying noise across the entire frequency spectrum
Solution Approach 2:
The programmable zero locations enable precise control over which frequency components are enhanced, allowing the system to improve signal integrity in specific bands while minimizing noise amplification in other bands
Data Source
AI summary
Circuitry for receiving a high-speed serial data signal (e.g., having a bit rate in the range of about 10 Gpbs and higher) includes a two-stage, continuous-time, linear equalizer having only two serially connected stages. Phase detector circuitry may be provided for receiving the serial output of the equalizer and for converting successive pairs of bits in that output to successive parallel-form bit pairs. Further demultiplexing circuitry may be provided to demultiplex successive groups of the parallel-form bit pairs to final groups of parallel bits, which can be quite large in terms of number of bits (e.g., 64 parallel bits). Another aspect of the invention relates to multiplexer circuitry for efficiently going in the opposite direction from such relatively large groups of parallel data bits to a high-speed serial data output signal.