RF Circuit Impedance Matching via Conductive Ring Inductance
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Solution Overview
Problem
Transceiver circuits face challenges in achieving high efficiency and small size due to high radio frequency (RF) losses and noise issues, particularly in low noise amplifiers (LNAs), which are exacerbated by mutual coupling and size constraints.
Innovation Solution
The implementation of a high-frequency circuit with a conductive ring material around active components on a substrate, configured to generate inductance that matches impedance characteristics, reducing noise and enhancing gain through impedance matching, and the use of a high-frequency conductor connected to the transistor gate to decrease noise figure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If amplifiers are designed for high efficiency, then power consumption is reduced, but achieving small size becomes difficult
Solution Approach 1:
The patent combines the impedance matching function and noise shielding function into a single integrated structure. The conductive ring serves dual purposes: providing inductance for impedance matching while simultaneously acting as a shield to block noise from coupling into the amplifier circuit, thereby achieving high efficiency without increasing size
Solution Approach 2:
The conductive ring structure performs multiple functions simultaneously: it provides inductance for impedance matching, acts as a noise shield, and serves as part of the amplifier's biasing network. This multi-functionality allows the amplifier to achieve high efficiency in a compact form factor
2Volume of moving object
If integrated amplifiers are made on semiconductor substrate, then miniaturization is achieved, but radio frequency losses increase
Solution Approach 1:
The conductive ring acts as an intermediary element that compensates for substrate losses. By providing additional inductance through the ring structure, the circuit can maintain proper impedance matching and resonance conditions despite the inherent losses in the semiconductor substrate, thereby reducing overall RF losses while maintaining miniaturization
3Object-affected harmful factors
If noise mitigation techniques are applied to low noise amplifiers, then noise figure is reduced, but space requirements increase
Solution Approach 1:
The patent merges the noise shielding function with the impedance matching structure. The same conductive ring that provides inductance for impedance matching also serves as a shield to block noise from adjacent circuits and substrate, thereby reducing noise figure without requiring additional space for separate shielding structures
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
This approach effectively mitigates noise and improves gain in RF transceivers by reducing noise figure and minimizing space requirements, allowing for more compact RF circuit designs.
Implementation Method 1
The upper conductive ring material is configured to generate an inductance that matches input impedance characteristics of the active circuit
Implementation Method 2
a conductive ring material in the substrate and around at least a portion of the active circuit
Data Source
AI summary
A radio frequency (RF) circuit is configured for impedance matching, such as for mitigating noise. In connection with an example embodiment, an RF circuit includes a transceiver in a substrate, and a conductive ring-type of material in the substrate and around at least a portion of the transceiver circuit. An upper conductive ring material is over the substrate and separated from the conductive ring-type material by an insulating layer. The upper conductive ring material is configured to generate an inductance that matches input impedance characteristics of the transceiver circuit. In some implementations, the upper conductive ring material connects a gate input pin of the circuit with the gate of an input transistor of an amplifier in the transceiver, and exhibits an impedance that matches the impedance of the input transistor.