Wideband RF Transceiver Circuit With Shared Filter Paths
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Solution Overview
Problem
Developing wide-band RF transceivers is challenging due to the need for multiple filters and components that consume significant space and power, making it difficult to integrate them into compact systems while maintaining efficient operation.
Innovation Solution
A modular design using a three-dimensional interposer with integrated filters and resource sharing across local oscillator circuits, allowing for swappable elements and reduced footprint in a system-in-package architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple filters and components are used to achieve wide tuning range, then frequency coverage is improved, but device footprint and power consumption increase
Solution Approach 1:
Multiple filter functions are merged into a single reconfigurable filter circuit that can be dynamically adjusted to provide different frequency responses. The filter uses a shared resonant circuit with switchable capacitive elements, allowing one physical component to perform multiple filtering functions across different frequency bands, thereby reducing the overall device footprint while maintaining wide frequency coverage.
Solution Approach 2:
The filter circuit is designed as a universal multi-functional unit that can operate across multiple frequency bands (including GPS L1/L2, GLONASS, Galileo, and satellite communication bands). By using voltage-controlled oscillators and switchable capacitor networks, the same filter hardware provides frequency-selective filtering for diverse communication standards, eliminating the need for separate dedicated filters for each band.
2Adaptability or versatility
If multiple filters and components are used to achieve wide tuning range, then frequency coverage is improved, but power consumption increases
Solution Approach 1:
Multiple filter functions are merged into a single reconfigurable filter circuit that can be dynamically adjusted to provide different frequency responses. The filter uses a shared resonant circuit with switchable capacitive elements, allowing one physical component to perform multiple filtering functions across different frequency bands, thereby reducing the overall device footprint while maintaining wide frequency coverage.
Solution Approach 2:
The filter employs voltage-controlled oscillators that are activated only when specific frequency bands are needed, rather than continuously operating multiple independent oscillators. The control logic selectively enables relevant oscillator and filter combinations based on the current communication standard being used, reducing overall power consumption while maintaining the capability to cover multiple frequency bands on demand.
3Device complexity
If fixed frequency design is used, then circuit simplicity is improved, but adaptability to different frequency bands deteriorates
Solution Approach 1:
The filter circuit incorporates dynamic reconfigurability through voltage-controlled oscillators and electronically switchable capacitor networks. The resonant frequency and filtering characteristics can be dynamically adjusted by changing control voltages and switching capacitor configurations, allowing the same fixed physical circuit to adapt to different frequency bands (GPS L1/L2, GLONASS, Galileo, satellite communications) without requiring multiple dedicated circuits for each band.
Data Source
AI summary
A communications circuit includes a first circuit block and a second circuit block. The first circuit block includes a first splitter, a first signal path coupled to a first output of the first splitter, a second signal path coupled to a second output of the first splitter, and a first switch configured to couple the second signal path to a third signal path or to couple a fourth signal path to the third signal path. The second circuit block includes a second splitter, a fifth signal path coupled to a first output of the second splitter, a sixth signal path coupled to a second output of the second splitter, and a second switch configured to couple the sixth signal path to the third signal path or to couple a seventh signal path to the third signal path. The third signal path extends between the first and second circuit blocks.