Hybrid Thyristor Circuit for RF Transceiver ESD Protection
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Solution Overview
Problem
Existing transceivers face challenges in achieving effective electro-static discharge (ESD) protection at high frequencies due to the addition of parasitic resistance, capacitance, and inductance from ESD protection elements, which often results in the omission of ESD protection in RF circuits.
Innovation Solution
A hybrid circuit that integrates a transistor-driven thyristor triggered by a driver circuit to divert ESD transients to ground, eliminating the need for separate TX/RX switches and ESD protection circuits, thereby reducing parasitics and enhancing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ESD protection elements are added to the input/output pad, then protection from electro-static discharge is improved, but parasitic resistance, capacitance and inductance increase
Solution Approach 1:
The patent combines the TX/RX switch function and ESD protection function into a single integrated circuit. The thyristor serves dual purposes: acting as the ESD protection element and simultaneously functioning as the TX/RX switch. This merging eliminates the need for separate ESD protection elements that would add parasitics, while maintaining both protection and switching capabilities.
Solution Approach 2:
The thyristor is designed to perform multiple functions: ESD protection, TX/RX switching, and transient diversion. By making the protection element multi-functional, the patent avoids adding dedicated ESD protection components that would introduce parasitic resistance, capacitance, and inductance to the RF circuit.
2Reliability
If separate ESD protection circuits are added, then protection from electro-static discharge is improved, but device complexity increases
Solution Approach 1:
The patent merges the ESD protection circuit with the TX/RX switch circuit into a single integrated structure. The thyristor replaces both the separate ESD protection element and the switch, reducing the number of components and simplifying the overall circuit architecture while maintaining both protection and switching functions.
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 hybrid circuit effectively protects RF input devices from ESD events while minimizing parasitic effects, improving performance, reducing losses, and lowering power consumption by integrating switching and ESD protection functions.
Implementation Method 1
protecting a radio-frequency input device from a source of an electro-static discharge
Implementation Method 2
at least one electro-static discharge protection element is connected to the input node for diverting a transient associated with the electro-static discharge to ground
Implementation Method 3
A transistor is provided for triggering the protection element. The transistor has a drain, a source and a gate. The drain is connected to the input node and the source is connected to ground
Data Source
AI summary
A hybrid circuit (42) for use with communications transceivers. The hybrid circuit (42) combines the function of an ESD protection circuit (12) with the function of a TX/RX switch (10). The input node of the hybrid circuit (42) is connecting between the source of an ESD event (60) and a device to be protected (44). The hybrid circuit (42) includes an ESD protection element (50), which is triggered by a triggering transistor (52). The gate of the triggering transistor (52) is connected to a driver (54) for turning the triggering transistor (52) on during transmission and for turning the triggering transistor (52) off during reception.