Full-Duplex RF Transceiver with Tunable Oscillators for Interference Control
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Solution Overview
Problem
Integrated transceiver systems face challenges due to close proximity of signal paths, leading to cross-talk and interference, limited component selection, fixed frequency operation, and inability to automatically adjust gain or compensate for external temperature changes.
Innovation Solution
An integrated full-duplex transceiver with independently tunable local oscillators, variable gain amplifiers, and temperature compensation, allowing for automatic retuning and gain adjustment, along with a multiplexer and injection switchable image reject mixer, enabling operation across multiple frequency bands and external temperature compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discrete components are assembled on printed circuit boards, then circuit flexibility and component selection are improved, but system size and signal delay increase
Solution Approach 1:
The patent integrates multiple discrete components (amplifiers, mixers, oscillators, filters) onto a single integrated circuit substrate, combining previously separate functional blocks into one unified device. This merging reduces system size while maintaining circuit flexibility through programmable control of the integrated components.
2Adaptability or versatility
If discrete components are assembled on printed circuit boards, then component selection is improved, but signal delay increases
Solution Approach 1:
By integrating all signal processing components onto a single substrate with short interconnect traces, the patent eliminates the large signal path delays inherent in distributed discrete component systems. The merged architecture maintains component functionality while reducing propagation delay.
3Volume of moving object
If components are integrated on a single substrate, then system size is reduced, but cross-talk and interference increase
Solution Approach 1:
The patent extracts and separates signal paths into distinct regions on the integrated substrate, isolating high-frequency and sensitive signal paths from each other. This spatial separation reduces cross-talk and interference while maintaining the compact integrated form factor.
Solution Approach 2:
The patent implements different design characteristics in different regions of the integrated circuit, such as shielding certain areas, using differential signaling in specific paths, and optimizing trace geometries locally to minimize interference. This localized approach addresses cross-talk issues without compromising overall integration.
4Volume of moving object
If integrated systems are designed with space constraints, then system size is reduced, but component selection and functionality are limited
Solution Approach 1:
The patent designs the integrated circuit with programmable components that can perform multiple functions. The amplifier, mixers, and oscillators can be configured through digital control to provide different gain levels, frequency conversions, and operational modes, effectively increasing component selection and adaptability within the compact integrated form factor.
5Ease of manufacture
If integrated transceivers are designed with fixed frequency operation, then manufacturing complexity is reduced, but adaptability decreases
Solution Approach 1:
The patent implements programmable frequency synthesis and tuning capabilities in the integrated circuit, allowing the oscillator and mixer frequencies to be dynamically adjusted through digital control. This enables the transceiver to operate across multiple frequency bands while maintaining a single integrated manufacturing process.
6Device complexity
If integrated transceivers have fixed gain settings, then device complexity is reduced, but operational flexibility is limited
Solution Approach 1:
The patent incorporates programmable gain control in the amplifier stages, allowing the gain to be dynamically adjusted through digital control signals. This enables adaptive gain settings for different operating conditions and signal levels while maintaining a relatively simple integrated circuit architecture.
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
The solution results in a compact, reliable transceiver that can operate in full-duplex mode, automatically adjust gain, and compensate for external temperatures, minimizing interference and enhancing compatibility with legacy devices.
Implementation Method 1
A gain associated with the VGA may, in various embodiments, depend upon a signal generated by a temperature controlled resistor and/or a thermistor
Data Source
AI summary
The present disclosure includes an integrated full-duplex transceiver, which may be implemented on a single substrate or die. A single substrate may in turn, comprise, an I/O port configured for full-duplex operation, a transmit portion and a receive portion, a first mixer for up-converting a transmit signal, a second mixer for down-converting a receive signal, a first independently tunable local oscillator that drives the first mixer, and a second independently tunable local oscillator that drives the second mixer. The first independently tunable oscillator may facilitate up-conversion of a transmit IF signal, while a second independently tunable oscillator may facilitate down-conversion of a receive RF signal.