Analog IQ Correction Circuit for Wired Communication
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Solution Overview
Problem
In wired communication systems, the use of quadrature modulation to achieve high communication speeds results in IQ interference noise, which complicates signal processing and limits bandwidth utilization due to frequency asymmetry in wired communication channels, making it difficult to maintain high data transfer rates.
Innovation Solution
The reception apparatus incorporates correction circuits with reverse and positive phase amplifiers and capacitative elements to compensate for IQ interference noise between I and Q components in an analog manner, allowing for effective noise cancellation and expanded signal bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If quadrature modulation is used to accelerate communication speed, then communication speed is improved, but IQ interference noise increases
Solution Approach 1:
The patent converts the harmful IQ interference noise into a beneficial signal by using the Q component signal to compensate for the I component signal through analog correction circuits. The correction circuits use reverse phase amplifiers and capacitative elements to process the Q signal and subtract it from the I signal, thereby eliminating the interference and recovering the original high-speed communication capability.
2Object-generated harmful factors
If analog correction circuits are added to compensate for IQ interference noise, then noise reduction is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex digital signal processing systems with simpler analog correction circuits. By using analog components such as reverse phase amplifiers, positive phase amplifiers, and capacitative elements, the system achieves IQ interference cancellation without requiring complex digital algorithms or additional processing stages, thus minimizing the increase in device complexity.
3Adaptability or versatility
If frequency asymmetry in wired communication channels is present, then communication compatibility is maintained, but bandwidth utilization is limited
Solution Approach 1:
The patent changes the frequency parameters of the I and Q components by using reverse phase amplifiers and positive phase amplifiers with different frequency responses. This allows the system to adapt to the frequency asymmetry of wired communication channels while expanding the usable signal bandwidth beyond the limitations of conventional symmetric frequency allocation.
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 significantly reduces IQ interference noise, enabling higher communication speeds and expanding usable signal bands, thus improving data transfer rates in wired communication systems.
Implementation Method 1
The correction circuit 27i includes a reverse phase amplifier 27i1 and a capacitative element 27i2
Implementation Method 2
The correction circuit 27q includes a positive phase amplifier 27q1 and a capacitative element 27q2
Implementation Method 3
The correction circuit 27i includes a reverse phase amplifier 27i1 and a capacitative element 27i2. The correction circuit 27q includes a positive phase amplifier 27q1 and a capacitative element 27q2
Data Source
AI summary
According to one embodiment, in a reception apparatus, a reception node is capable of being connected to a wired communication channel. A first frequency conversion circuit is electrically connected to the reception node. A second frequency conversion circuit is electrically connected to the reception node. A first adder circuit is electrically connected to the first frequency conversion circuit. A second adder circuit is electrically connected to the second frequency conversion circuit. A first correction circuit is electrically connected between the first frequency conversion circuit and the second adder circuit. A second correction circuit is electrically connected between the second frequency conversion circuit and the first adder circuit. The first correction circuit includes a reverse phase amplifier and a first capacitative element. The second correction circuit includes a positive phase amplifier and a second capacitative element.