Envelope Detection Device for High Speed Serial Communication
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Solution Overview
Problem
Existing communication devices require multiple envelope detection devices and corresponding comparison circuits to detect different signal states on USB buses, leading to increased circuit complexity and manufacturing costs.
Innovation Solution
An envelope detection device that uses a single comparison circuit to detect various transmission states and disconnect states by employing an operation circuit and a reference signal generation circuit, which generates different reference signal levels for comparison, allowing the device to recognize multiple states without the need for multiple detection devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple envelope detection devices are used to detect different signal states, then the detection capability and reliability are improved, but the circuit complexity and manufacturing costs increase
Solution Approach 1:
The patent combines multiple envelope detection devices into a single integrated device that can detect multiple signal states (squelch state at 100mV threshold, Chirp J/K states at ±300mV thresholds, and disconnect state at 625mV threshold) using shared comparison circuits and reference signal generation circuits, thereby reducing circuit complexity while maintaining detection capability
Solution Approach 2:
The single envelope detection device is designed to perform multiple detection functions by comparing the differential signal against multiple reference levels corresponding to different USB communication states, allowing one device to replace multiple specialized detectors
2Measurement precision
If multiple comparison circuits are used to compare differential signal with multiple reference levels, then the state detection accuracy is improved, but the manufacturing costs increase
Solution Approach 1:
The patent merges multiple comparison circuits into a single comparison circuit that sequentially or selectively compares the differential signal against multiple reference levels (100mV, 150mV, ±300mV, 525mV, 625mV) to determine communication states, reducing component count and manufacturing cost while maintaining detection accuracy
3Measurement precision
If multiple reference signal generation circuits are used to provide reference signals at different levels, then the detection precision for different states is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple reference signal generation circuits into a single circuit that generates multiple reference levels corresponding to different USB communication state thresholds, reducing device complexity while maintaining the ability to precisely detect different states through selective comparison
Data Source
AI summary
An envelope detection device for detecting a transmission signal of a high speed serial communication includes: an operation circuit, for receiving the transmission signal and generating a set of operated outputs according to the transmission signal and at least one reference signal; a reference signal generating circuit coupled to the operation circuit, for providing the reference signal to the operation circuit, wherein the reference signal generating circuit is operable to provide the reference signal with different voltage levels; and a comparing circuit coupled to the operation circuit, for comparing the set of calculated outputs to generate a comparison result. The envelope detection device detects a transmission state and a disconnect state of the high speed serial communication according to the comparison result generated based on the reference signals at different voltage levels.