Integrated Circuit Receiver Baseline Wander Correction

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Solution Overview

Problem

Existing data communication systems in integrated circuits face challenges with baseline wander, which reduces the received eye margin and increases bit error rate due to difficulties in determining bandwidth and gain parameters for adaptive filtering techniques, and requires high power consumption for sampling rates twice the data rate.

Innovation Solution

The implementation of a circuit and method that uses a receiver with a level detection circuit, error detection circuit, and control circuit to selectively generate offset or amplitude control signals based on comparisons with two reference voltages, allowing for adaptive baseline wander correction with flexible response and minimal additional hardware cost, suitable for both baud rate and double rate sampling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If adaptive filtering techniques (analog low pass filter or digital IIR filter) are used for baseline wander correction, then baseline wander can be corrected, but the bandwidth and gain parameters are difficult to determine and adapt, requiring manual sweeping which is costly and time consuming

Engineering Contradiction:

Improvebaseline wander correction accuracyVSAvoidparameter determination and adaptation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system automatically determines bandwidth and gain parameters without manual intervention. The bandwidth is derived from the sampling rate and data rate relationship, while the gain is automatically calculated based on signal characteristics, eliminating the need for manual sweeping and complex parameter tuning.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent dynamically adjusts filter parameters based on operating conditions. The bandwidth parameter is changed according to the relationship between sampling rate and data rate, and the gain parameter is adjusted based on signal amplitude and baseline wander conditions, enabling adaptive correction without manual intervention.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If data crossing information is used for baseline wander correction, then correction can be achieved, but it requires a sampling rate of twice the data rate, consuming more power than baud rate sampling

Engineering Contradiction:

Improvebaseline wander correction capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system dynamically selects the optimal sampling rate based on the data rate and correction requirements. Instead of fixed double-rate sampling, the patent adapts the sampling rate to match the data rate when possible, reducing power consumption while maintaining effective baseline wander correction through intelligent parameter selection.

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If manual sweeping is used to determine filter parameters, then accurate bandwidth and gain values can be obtained, but the process is costly and time consuming

Engineering Contradiction:

Improvebandwidth and gain parameter accuracyVSAvoidparameter determination time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary calculations to determine filter parameters before actual baseline wander correction begins. The bandwidth is pre-calculated from the sampling rate and data rate relationship, and the gain is pre-determined based on signal characteristics, eliminating the need for time-consuming manual sweeping during operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces manual mechanical sweeping with automated electronic parameter determination. Instead of manually adjusting filters to find optimal parameters, the system automatically calculates bandwidth and gain values based on digital signal characteristics and operating conditions, significantly reducing time and cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS9237047B1Circuits for and methods of receiving data in an integrated circuit

Publication Date: 2016.01.12 XILINX INC

AI summary

A circuit for receiving data in an integrated circuit is described. The circuit comprises a receiver configured to receive an input signal and to generate output data based upon the input signal, the receiver having a level detection circuit coupled to receive the input signal; and a calibration circuit coupled to the receiver, the calibration circuit having an input for receiving the input signal; an error detection circuit coupled to the input, the error detection circuit coupled to receive the input signal, a first reference voltage and a second reference voltage; and a control circuit coupled to an output of the error detection circuit, wherein the control circuit selectively generates either an offset control signal or an amplitude control signal based upon comparisons of the input signal to the first reference voltage and the second reference voltage. A method of receiving data is also disclosed.