Signal Coupling Apparatus for RF Phase Noise Reduction
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Solution Overview
Problem
Conventional methods for coupling radio frequency signals at different frequencies from one circuit part to another often result in significant loading effects on the out-coupling circuit, leading to phase noise and additional parasitic effects, especially in high-frequency applications like millimeter waves, and require multiple components for separate frequency coupling.
Innovation Solution
The use of different coupling mechanisms, such as inductive and capacitive coupling, to separate and transmit signals at different frequencies from a single circuit part, with one signal being coupled as a differential signal and the other as a common mode signal, utilizing a single transmission element and achieving DC isolation to minimize loading on the out-coupling circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct coupling is used to couple out signals from a circuit part, then signal coupling is achieved, but loading effects on the out-coupling circuit part increase
Solution Approach 1:
The patent introduces a coupling apparatus as an intermediary component between the out-coupling circuit part and the receiving circuits. This coupling apparatus includes a first coupling element and a second coupling element that separately couple different frequency signals, acting as a mediator that prevents direct loading of the out-coupling circuit part while still achieving signal transfer.
Solution Approach 2:
The coupling apparatus segments the signal coupling function into separate coupling paths for different frequencies. The first coupling element handles the first frequency signal while the second coupling element handles the second frequency signal, allowing independent optimization of each coupling path and preventing mutual interference and loading effects.
2Reliability
If multiple components are used to couple out signals at different frequencies, then signal separation is achieved, but device complexity increases
Solution Approach 1:
The patent merges multiple coupling functions into a single integrated coupling apparatus. The first coupling element and second coupling element are combined in one apparatus that couples to a single out-coupling circuit part, achieving signal separation without requiring multiple separate components or circuits.
Solution Approach 2:
The coupling apparatus is designed with multi-functionality to handle both first frequency signals and second frequency signals through its respective coupling elements. This universal design allows a single apparatus to perform what would traditionally require multiple separate components, reducing overall device complexity.
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 separates signals at different frequencies with minimal loading on the out-coupling circuit, reducing phase noise and parasitic effects, and allows for compact design without the need for additional components, suitable for high-frequency applications like voltage controlled oscillators.
Implementation Method 1
a first coupling element, arranged to inductively couple a first signal, supplied as a differential signal, from the out-coupling circuit part to the first circuit part
Implementation Method 2
a second coupling element, arranged to capacitively couple a second signal, supplied as a common mode signal, from the out-coupling circuit part to the second circuit part
Data Source
AI summary
Coupling apparatuses, circuits having such coupling apparatuses and corresponding methods are provided that involve a first and a second signal being coupled out from an out-coupling circuit part and being separately coupled into first and second circuit pmts. The use of different coupling mechanisms effects signal separation in this case. In particular, one of the signals can be coupled as a differential signal and the other as a common mode signal.