Capacitive-Summing Junction Equalizer for Proximity Signal Integrity
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Solution Overview
Problem
Proximity communication systems face signal loss and delays due to long signal lines with appreciable resistance, capacitance, and inductance, which attenuate high-frequency signals and degrade data rates.
Innovation Solution
A semiconductor die with proximity connectors and a circuit that includes a filter with a capacitive-summing junction to equalize signals, using finite impulse response (FIR) or infinite impulse response (IIR) filters, and adjustable weights to reduce cross-talk and enhance bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If long signal lines are used to connect transmit/receive circuits to proximity pads, then the circuits can be positioned away from the pads, but signal loss and delays increase due to appreciable resistance, capacitance, and inductance
Solution Approach 1:
The patent applies preliminary action by implementing equalization filters that pre-compensate for signal degradation before the signal traverses the long interconnect lines. The transmit equalizer adjusts the signal characteristics in advance to counteract the anticipated attenuation and distortion from the long signal lines, while the receive equalizer further compensates for remaining degradation after signal transmission.
2Ease of operation
If long signal lines are used, then circuit positioning flexibility improves, but data rates decrease due to dominant pole attenuation at high frequencies
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the equalization filter characteristics (such as pole-zero locations and gain values) to optimize signal transmission across varying frequency ranges. The equalizers modify their transfer function parameters to compensate for the frequency-dependent attenuation introduced by long interconnect lines, thereby maintaining high data rates despite the increased line length.
3Loss of energy
If multiple proximity connectors are used to reduce signal loss, then signal attenuation decreases, but cross-talk between signal paths increases
Solution Approach 1:
The patent uses equalization filters as intermediary processing elements that selectively enhance desired signal components while suppressing cross-talk interference. The filters act as mediators between the multiple proximity connectors and the receive circuits, applying differential weighting and phase adjustment to cancel out cross-talk signals while preserving the intended data transmission.
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
The solution improves communication by reducing signal loss, increasing data rates, and lowering power consumption, while maintaining a low bit error rate through uniform frequency response and reduced inter-symbol interference.
Implementation Method 1
communicate voltage-mode signals through capacitive coupling using one or more of the plurality of proximity connectors
Data Source
AI summary
A device includes a semiconductor die having a surface, a plurality of proximity connectors proximate to the surface, and a circuit coupled to at least one of the plurality of proximity connectors. The semiconductor die is configured to communicate voltage-mode signals through capacitive coupling using one or more of the plurality of proximity connectors. The circuit also includes a filter with a capacitive-summing junction to equalize the signals.