Wireless Transceiver Front-End Circuit Without RX Antenna Switch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing front-end circuits for wireless transceivers face challenges in reducing pin count, noise figure, and output power due to the need for multiple impedance matching circuits and signal switching, which leads to increased signal loss and degraded performance in low noise figure or high output power applications.
Innovation Solution
A front-end circuit design that integrates a receiver and transmitter within a single chip, eliminating the need for internal switches and impedance matching circuits on signal paths, allowing for reduced pin count and selective provision of impedance matching circuits, thereby reducing noise figure and increasing output power by adjusting impedance matching between the antenna unit and the receiver or transmitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple external impedance matching circuits are provided between the antenna unit and the receiver/transmitter, then impedance matching can be achieved, but the pin count of the chip increases
Solution Approach 1:
The patent merges the impedance matching function into the receiver and transmitter circuits themselves, eliminating the need for separate external impedance matching circuits. The receiver circuit includes an impedance matching circuit connected between the antenna unit and the receiver, and the transmitter circuit includes an impedance matching circuit connected between the antenna unit and the transmitter, thereby reducing the pin count while maintaining impedance matching capability
Solution Approach 2:
The receiver and transmitter circuits are designed to perform multiple functions: signal reception/transmission and impedance matching. This multi-functionality eliminates the need for dedicated external impedance matching circuits, reducing the overall device complexity and pin count
2Ease of operation
If the switch is used for controlling to receive or transmit signal, then signal routing can be achieved, but signal loss occurs and noise figure increases
Solution Approach 1:
The patent introduces a transmitting block as an intermediary between the switch and the antenna unit. This transmitting block includes an impedance matching circuit that compensates for signal loss introduced by the switch, thereby reducing the noise figure while maintaining signal routing control capability
Solution Approach 2:
The impedance matching circuit dynamically adjusts impedance parameters to compensate for signal loss and noise figure degradation caused by the switch. By changing the impedance parameters of the matching circuit, the system optimizes signal transmission quality while maintaining switching control functionality
Data Source
AI summary
A front-end circuit of the wireless transceiver is disclosed to reduce the number of the pin count of the chip, and achieve the impedance matching. The circuit comprises an antenna unit, a receiver, and a transmitting block, all of which are connected together, wherein there is no switch provided between the receiver and the antenna unit, such that the loss of switch can be avoided for reducing the noise figure and improve the sensitivity of the receiving path accordingly.