USB Repeater Detector Circuit With Switchable Squelch and Disconnect
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Solution Overview
Problem
USB2.0 technology faces challenges in power efficiency and reliability due to densely packed transistors and increasing manufacturing costs for 3.3V IO signaling, necessitating a low voltage solution for inter-chip interconnects, while existing USB repeaters require separate squelch and disconnect detectors for high-speed communication.
Innovation Solution
A circuit that combines squelch and disconnect detectors in a USB repeater, enabling only one function at a time, using a threshold generator and a switchable RC network to provide predefined thresholds and optimize power usage, allowing for flexible design and reduced silicon area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate squelch detector and disconnect detector are used in USB repeater, then detection accuracy for high-speed communication is improved, but device complexity and silicon area increase
Solution Approach 1:
The patent combines separate squelch detector and disconnect detector circuits into a single integrated detector unit. The combined detector uses a unified detection mechanism with configurable thresholds to perform both squelch detection (during receive mode) and disconnect detection (during transmit mode), thereby reducing silicon area and device complexity while maintaining detection accuracy through mode-dependent threshold configuration.
Solution Approach 2:
The detector is designed as a universal multi-functional unit that can operate in both squelch detection mode and disconnect detection mode. By using a single detector with configurable parameters rather than separate dedicated detectors, the design achieves multi-functionality that reduces overall device complexity and component count while preserving the accuracy requirements for both detection functions.
2Adaptability or versatility
If separate squelch detector and disconnect detector are used in USB repeater, then detection functionality is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges separate detector circuits into a single integrated unit, directly reducing the number of transistors, interconnects, and silicon real estate required. This consolidation lowers manufacturing complexity and material usage, thereby reducing production costs while maintaining both squelch and disconnect detection functionalities through a unified detection architecture.
Solution Approach 2:
The universal detector design enables a single circuit to perform multiple detection functions (squelch and disconnect detection) that would otherwise require separate dedicated circuits. This multi-functionality reduces the total component count and manufacturing complexity, leading to lower production costs while preserving full detection capability across different operational modes.
3Use of energy by moving object
If low voltage USB2.0 solution is implemented, then power efficiency is improved, but manufacturing cost for advanced process technology increases
Solution Approach 1:
The patent transitions from 3.3V IO signaling to low-voltage (e.g., 1.8V or lower) operation, fundamentally changing the voltage parameter of the USB interface. This parameter change reduces dynamic power consumption (P = CV²f) and improves power efficiency, although it requires adoption of advanced CMOS process technologies that have higher per-wafer costs. The design accepts this trade-off as power efficiency becomes increasingly critical in modern computing devices.
Data Source
AI summary
A circuit is disclosed. The circuit includes an input port, an output port, a squelch detector and a disconnect detector. The squelch detector and the disconnect detector are enabled or disabled by a signal such that only one of the squelch detector and the disconnect detector is active at a given time. When the squelch detector is active, a threshold generator generates a squelch threshold for the squelch detector based on a squelch configuration data indicative of a predefined squelch threshold. When the disconnect detector is active, the threshold generator generates a disconnect threshold for the disconnect detector based on a disconnect configuration data indicative of a predefined disconnect threshold.