Concurrent Multiband Transceiver RF Front-End Design
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Solution Overview
Problem
Existing multiband receiver and transmitter systems are costly, power-intensive, and have limited throughput due to the need for multiple components or tunable elements, and they typically operate in only one frequency band at a time, lacking concurrent dual-mode operation.
Innovation Solution
An RF front-end design that uses a phase shifter, input matching circuit, and output matching circuit with amplifiers to enable simultaneous operation in multiple frequency bands, eliminating the need for switches or tunable components, and allowing for both common and differential mode operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If parallel transmitters or receivers are used for different frequency bands, then multiband operation capability is improved, but component count, area and power consumption increase
Solution Approach 1:
The patent implements a single transmitter circuit that can operate in multiple frequency bands (first and second frequency bands) by using common components such as the power amplifier, matching networks, and control circuitry. The circuit is designed with adjustable parameters that allow it to be reconfigured for different bands, eliminating the need for separate parallel transmitters for each band.
2Adaptability or versatility
If tunable elements like varactors are used, then frequency band tuning capability is improved, but cost and circuit complexity increase
Solution Approach 1:
The patent changes operating parameters such as impedance values, matching network configurations, and control signal settings to enable operation in different frequency bands. Instead of using tunable elements like varactors, the invention adjusts fixed parameters of the circuit components and their interconnections to achieve frequency band switching.
3Adaptability or versatility
If switching between frequency bands is implemented, then multiband operation is achieved, but additional circuitry and switching complexity are required
Solution Approach 1:
The patent merges the functionality of multiple frequency band operations into a single integrated circuit path. The input matching network, power amplifier, and output matching network are designed to handle both frequency bands simultaneously or sequentially without requiring separate switching paths or additional switching circuitry for each band.
4Adaptability or versatility
If wideband circuits are used, then bandwidth coverage is improved, but sensitivity to unwanted signals increases
Solution Approach 1:
The patent segments the operating bandwidth into distinct frequency bands (first frequency band and second frequency band) with optimized matching networks for each band. By designing separate matching networks tailored to specific bands rather than a single wideband network, the circuit achieves good performance in each band while maintaining selectivity against unwanted signals through proper impedance matching and filtering characteristics.
Data Source
AI summary
The invention refers to an RF front-end (100) adapted to perform either in a receiving mode or in a transmitting mode and adapted to receive or transmit signals located in at least two separated frequency bands, respectively comprising an input and an output and further comprisingan input matching circuit (1) comprising a first input coupled to the input of the RF front-end (100),an output matching circuit (2) coupled to the output;the input matching circuit (1) being coupled to the output matching circuit (2) via respective first amplifier (3) and second amplifier (4), anda phase shifter (5) coupled either to the input of the RF front-end (100) in a receiving mode, or to the output of the RF front-end (100) in a transmitting mode.