Differential Oscillator Circuit for Adjacent Harmonic Suppression
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Solution Overview
Problem
In 5G wireless communication systems, generating high-frequency oscillating signals is challenging due to the generation of unwanted harmonic components by frequency multipliers, which are difficult to suppress using conventional filtering methods, especially for adjacent harmonics, limiting the operating frequency range and system design complexity.
Innovation Solution
The proposed solution involves an apparatus and method that utilize a differential signal approach, where a base oscillating signal is generated and multiplied to produce a high-frequency signal, with an adjacent harmonic component suppressing unit performing linear operations between the differential signals to eliminate adjacent harmonics, and a non-adjacent harmonic component suppressing unit using filtering to reduce non-adjacent harmonics, effectively generating an oscillating signal of an intended frequency while suppressing unwanted harmonic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If frequency multipliers are used to generate high-frequency oscillating signals, then the operating frequency range is extended, but unwanted harmonic components are generated that are difficult to suppress
Solution Approach 1:
The patent converts the harmful harmonic components generated by frequency multipliers into beneficial suppressed signals by intentionally generating differential signals that, when combined, cancel out the unwanted harmonics while preserving the desired frequency components
Solution Approach 2:
The patent introduces asymmetry in the signal generation process by using differential signaling where one signal path is intentionally designed to be opposite to the other, creating phase differences that enable harmonic cancellation through constructive and destructive interference
2Object-generated harmful factors
If conventional filtering methods are used to suppress harmonic components, then some harmonics can be reduced, but adjacent harmonic components remain difficult to suppress and system design complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-processing the signals through differential modulation before frequency multiplication, so that the harmonic components are already in a form that will naturally cancel out after multiplication, eliminating the need for complex post-filtering
Solution Approach 2:
The patent replaces the mechanical/conventional filtering approach with a signal processing approach using differential signaling and phase cancellation, substituting physical filtering complexity with elegant signal manipulation
3Object-generated harmful factors
If complex filtering is used to suppress adjacent harmonic components, then harmonic suppression improves, but the burden of complex filtering increases system complexity
Solution Approach 1:
The patent converts the problematic adjacent harmonic components into suppressed signals by using differential signaling where the harmonics generated in opposite-phase paths naturally cancel each other out, turning a filtering problem into a self-canceling signal property
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 generates oscillating signals of intended frequencies by suppressing harmonic components, particularly adjacent ones, thereby expanding the operating frequency range and simplifying system design by reducing the burden of complex filtering, enhancing the efficiency of high-frequency signal generation in 5G wireless communication systems.
Implementation Method 1
generating a base oscillating signal of a differential signal form, by multiplying a first signal and a second signal which constitute the different signal
Implementation Method 2
generate a signal in which at least one harmonic component adjacent to an intended frequency component is suppressed using the first signal set and the second signal set
Implementation Method 3
a non-adjacent harmonic component suppressing unit using filtering to reduce non-adjacent harmonics
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4th-Generation (4G) communication system such as long-term evolution (LTE). According to various embodiments of the present disclosure, an apparatus of a transmitter in a wireless communication system may include an oscillating circuit for providing an oscillating signal, and a radio frequency (RF) circuit for converting a frequency of a transmit signal using the oscillating signal, and transmitting the transmit signal. The oscillating circuit may generate a base oscillating signal of a differential signal form, by multiplying a first signal and a second signal which constitute the different signal, generate a first signal set from the first signal and a second signal set from the second signal, and generate a signal in which at least one harmonic component adjacent to an intended frequency component is suppressed using the first signal set and the second signal set.