Transceiving Circuit Shared Channel Switching
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Solution Overview
Problem
Conventional high-speed input/output interfaces struggle to meet the requirement of sharing a channel for both transmitting and receiving circuits, as seen in new integrated USB type-C and DP applications, due to their independent circuit structures.
Innovation Solution
A transceiving circuit design that includes a first transmitting circuit, a first receiving circuit, a first switching circuit, and a processing circuit, where the switching circuit connects or disconnects nodes to switch between transmitting and receiving modes, utilizing inductors to reduce parasitic effects and enhance bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two independent circuits (transmitting circuit and receiving circuit) are used for high-speed input/output interfaces, then the transmitting and receiving functions can be performed independently, but the hardware cost increases and the shared channel requirement cannot be met
Solution Approach 1:
The patent combines the transmitting circuit and receiving circuit into a single integrated transceiving circuit that shares common channels. The switching circuit dynamically connects or disconnects the first node with the third node to enable the same physical channel to serve both transmitting and receiving functions, thereby reducing hardware complexity while maintaining adaptability for shared channel requirements.
Solution Approach 2:
The patent employs a switching circuit that can dynamically change the connection state between nodes based on operational mode. When operating in transmitting mode, the switching circuit disconnects the first node from the third node; when operating in receiving mode, it connects them. This dynamic reconfiguration allows the circuit to adapt between different functional states, enabling shared channel capability without permanent dual-circuit complexity.
2Adaptability or versatility
If a switching circuit is added to enable mode switching between transmitting and receiving, then the shared channel requirement is met, but the device complexity increases
Solution Approach 1:
The switching circuit serves multiple functions: it enables mode switching between transmitting and receiving, facilitates shared channel operation, and supports different operational configurations. By making the switching circuit multi-functional, the patent reduces the need for additional dedicated components for each function, thereby limiting the increase in overall device complexity while achieving adaptability for mode switching.
3Speed
If inductors are used to reduce parasitic effects, then the transmitting and receiving bandwidth is increased, but the device complexity and cost increase
Solution Approach 1:
The patent introduces inductors (first inductor and second inductor) to modify the electrical parameters of the circuit, specifically to reduce parasitic effects that limit bandwidth. By carefully selecting inductor values and placing them at strategic locations (the second inductor coupled between first node and second node, first inductor with end coupled to second node), the circuit achieves improved transmitting and receiving bandwidth while keeping the component count reasonable.
Data Source
AI summary
A transceiving circuit includes a first transmitting circuit, a first receiving circuit, a first switching circuit and a processing circuit. The first transmitting circuit includes a first inductor and a second inductor, wherein the second inductor is coupled between a first node and a second node, and an end of the first inductor is coupled to the second node. The first receiving circuit is coupled to a third node. The first switching circuit is configured to conduct or block the first node and the third node. When the transceiving circuit is operated in a transmitting mode, the processing circuit is configured to control the first switching circuit to disconnect the first node with the third node. When the transceiving circuit is operated in a receiving mode, the processing circuit is configured to control the first switching circuit to connect the first node with the third node.