Shared Cancellation Circuit for Compact Multiband RF Filters
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Solution Overview
Problem
As the number of filters in multiband radio-frequency circuits increases, adding a cancellation circuit to each filter results in larger circuits, making it challenging to achieve compact and efficient radio-frequency circuits with improved transmission characteristics.
Innovation Solution
A radio-frequency circuit design that includes a common terminal connected to multiple bandpass filters and a shared cancellation circuit, which varies the amplitude and phase of bandpass characteristics, allowing for improved transmission characteristics without the need for multiple cancellation circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cancellation circuit is added to each filter in multiband radio-frequency circuits, then transmission characteristics such as bandpass characteristics and isolation between transmission and reception are improved, but the circuit size increases
Solution Approach 1:
The patent merges multiple cancellation circuits into a single shared cancellation circuit that serves multiple bandpass filters simultaneously. The cancellation circuit is connected to a common terminal that receives signals from multiple filters, allowing one cancellation circuit to improve transmission characteristics for all connected filters without requiring separate cancellation circuits for each filter, thus reducing overall circuit size while maintaining improved bandpass characteristics and isolation performance
Solution Approach 2:
The cancellation circuit is designed with universal functionality to handle signals from multiple different frequency bands. By connecting the cancellation circuit to a common terminal that aggregates signals from multiple bandpass filters operating at different frequencies, the single cancellation circuit performs the cancellation function across multiple bands, making it a multi-functional component that replaces what would traditionally require multiple separate cancellation circuits
Data Source
AI summary
A radio-frequency circuit includes a common terminal and a common terminal, a filter connected to the common terminal and the common terminal and having a first pass band, a filter connected to the common terminal and the common terminal and having a second pass band, and a cancellation circuit connected to the common terminal and the common terminal, connected in parallel with the filter and the filter, and configured to vary at least one of an amplitude and a phase in the bandpass characteristics.