Reconfigurable Multi-Band gm-C Filter for Non-Contiguous Carriers
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Solution Overview
Problem
Traditional wireless communication systems face limitations in handling multiple non-contiguous carriers due to limited flexibility, performance, and bandwidth, particularly in receiver architectures, which struggle with spurious intermodulation distortion and require multiple local oscillators, leading to increased complexity and area usage.
Innovation Solution
The implementation of a reconfigurable multi-band filter architecture using gyrator circuits and transconductance-capacitance (gm-C) filters, allowing for programmable frequency responses and the ability to handle multiple non-contiguous carriers with a single local oscillator, enabling flexible and efficient spectrum handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional receiver architectures use multiple local oscillators to handle multiple non-contiguous carriers, then the ability to process multiple carriers is improved, but device complexity and area usage increase
Solution Approach 1:
The patent implements a universal receiver architecture where a single local oscillator and a reconfigurable multi-band filter can handle multiple non-contiguous carriers across different frequency bands. The filter is designed with multiple resonant frequencies and can be programmed to pass specific carrier frequencies while rejecting others, eliminating the need for multiple dedicated oscillators and filters for each carrier band.
Solution Approach 2:
The multi-band filter employs dynamic reconfiguration capabilities through varactor diodes that can change the resonant frequencies of the filter sections. By adjusting the capacitance values of the varactors, the filter can adaptively select which frequency bands to pass, enabling a single static physical structure to perform multiple functions dynamically based on the desired carrier frequencies.
2Adaptability or versatility
If traditional systems use multiple local oscillators for multiple carriers, then carrier handling capability is improved, but spurious intermodulation distortion increases
Solution Approach 1:
The patent extracts and eliminates the source of intermodulation distortion by removing the multiple local oscillators from the system. Instead of using multiple oscillators that can interact and generate spurious signals, the invention uses a single local oscillator combined with a multi-band filter that provides the necessary frequency selection, thereby taking out the harmful interaction mechanism while preserving the carrier handling capability.
3Adaptability or versatility
If reconfigurable multi-band filter with gyrator circuits is used, then flexibility and spectrum handling efficiency are improved, but circuit complexity increases
Solution Approach 1:
The patent replaces traditional mechanical or switched-capacitor reconfiguration mechanisms with gyrator circuits that provide continuous and smooth tuning of the filter characteristics. The gyrators, implemented using transconductance circuits, allow for analog adjustment of the resonant frequencies without requiring physical switching or mechanical movement, thereby providing flexibility while maintaining circuit integration and reducing overall system complexity.
Data Source
AI summary
Certain aspects of the present disclosure relate to multi-band filter architectures and methods for filtering signals using the multi-band filter architectures. One example multi-band filter generally includes a transconductance-capacitance (gm-C) filter and a reconfigurable load impedance coupled to an output of the gm-C filter, the reconfigurable load impedance comprising a first gyrator circuit coupled to a second gyrator circuit.