Transceiver Circuit Dual-Mode Operation with Filter Bypass
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Solution Overview
Problem
Existing dual-mode transceivers face inefficiencies and increased costs due to filter losses in frequency division duplex (FDD) mode, which negatively impact time-division-duplex (TDD) mode power efficiency and battery life, and require additional switches to support both modes.
Innovation Solution
A circuit design that uses a single power amplifier and low noise amplifier, with switches bypassing filters in TDD mode to minimize losses, allowing simultaneous operation in both FDD and TDD modes with reduced signal loss and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FDD mode uses sharp filters to avoid transmitter interference with receiver, then frequency separation is achieved, but signal loss increases and power efficiency decreases
Solution Approach 1:
The patent implements dynamic switching between FDD and TDD operational modes, allowing the system to adapt its filtering and signal path configuration based on the selected mode. In TDD mode, the system dynamically bypasses the sharp filters to eliminate their associated signal losses, while in FDD mode the filters are activated to ensure proper frequency separation.
2Adaptability or versatility
If additional switches are inserted to support both FDD and TDD operation, then dual-mode capability is achieved, but device complexity increases
Solution Approach 1:
The patent designs a universal RF front-end architecture that can operate in both FDD and TDD modes using a single power amplifier and shared signal paths. The system employs mode-selective switching that consolidates the dual-mode functionality into a unified structure, avoiding the need for completely separate FDD and TDD receiver chains.
3Reliability
If filters are always present in the signal path, then frequency filtering is maintained, but power efficiency is reduced due to filter losses
Solution Approach 1:
The system dynamically reconfigures the signal path based on operational mode. In TDD mode, the switches bypass the sharp filters entirely, allowing the full signal power to reach the power amplifier without filter losses. In FDD mode, the filters are inserted into the signal path to provide the necessary frequency separation. This dynamic reconfiguration optimizes power efficiency for TDD operation while maintaining filtering when required for FDD operation.
Data Source
AI summary
A transceiver circuit is configured to operate in a first mode of operation and a second mode of operation such that a receive signal propagates from an antenna through a first filter to a low noise amplifier while simultaneously a transmit signal propagates from a power amplifier through a second filter to the antenna when operating in the first mode. The receive signal propagates from the antenna to the low noise amplifier without being filtered while alternating with the transmit signal propagating from the power amplifier to the antenna without being filtered when operating in the second mode.