Receiver Offset Cancellation via Peak Comparison for Jitter Control
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Solution Overview
Problem
The receiver yield is compromised due to increased jitter in differential signals caused by mismatched input differential pairs in receiving channel circuits, which is exacerbated by electromagnetic interference and power consumption limitations, leading to bandwidth degradation when attempting to enlarge the differential pair for compensation.
Innovation Solution
An automatic offset cancellation (AOC) method and circuit that detects and compensates for mismatches in the input differential pairs by comparing peak signals of equalized differential signals, adjusting bias currents as necessary to align the peaks and thus reduce jitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of the input differential pair is increased to compensate for mismatch and improve receiver yield, then the receiver yield is improved, but the bandwidth is degraded
Solution Approach 1:
The patent segments the mismatch compensation function from the main signal processing path by introducing a separate AOC circuit. This AOC circuit independently detects peak signals and generates compensation voltages without interfering with the primary differential signal flow, thus avoiding bandwidth degradation while still improving receiver yield through mismatch compensation.
Solution Approach 2:
The patent introduces an intermediary AOC circuit that acts as a mediator between the input differential pair and the equalization filter. This intermediary circuit generates compensation voltages based on detected peak signals and applies them to cancel offset errors, thereby improving receiver yield without requiring enlargement of the input differential pair and maintaining bandwidth.
2Loss of energy
If the swing of the differential signal is reduced due to EMI and power consumption limitations, then the power consumption and EMI are reduced, but the jitter of the equalized differential signal increases
Solution Approach 1:
The patent implements a feedback mechanism in the AOC circuit that detects peak signals from the equalized differential output and uses this information to generate compensation voltages. This feedback loop continuously monitors and corrects mismatch effects, maintaining signal quality even when the differential signal swing is reduced for lower power consumption and EMI.
Solution Approach 2:
The AOC circuit performs self-service by automatically detecting its own mismatch conditions through peak signal detection and generating its own compensation voltages. This self-correcting mechanism maintains signal quality without requiring external intervention or larger signal swings, enabling operation at lower power levels.
Data Source
AI summary
The disclosure provides a receiver and an automatic offset cancellation (AOC) method thereof. The receiver includes a receiving channel circuit and an AOC circuit. The receiving channel circuit generates an equalized differential signal including an equalized first-end signal and an equalized second-end signal according to an input differential signal. The AOC circuit detects a peak of the equalized first-end signal to generate a first peak detection result. The AOC circuit detects a peak of the equalized second-end signal to generate a second peak detection result. The AOC circuit compares the first peak detection result with the second peak detection result to generate a comparison result. The AOC circuit compensates a mismatch of an input differential pair in the receiving channel circuit according to the comparison result.