RF Switch Circuit Segmentation for Low-Distortion Multi-Band Transmission
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Solution Overview
Problem
The existing radio frequency modules with a single switch circuit for multiple duplexers suffer from increased signal distortion and large footprint due to high voltage application and increased number of terminals, leading to decreased signal quality and transmission performance during simultaneous signal transmission.
Innovation Solution
A radio frequency circuit design with multiple switch circuits and power amplifiers, where each switch circuit is connected to specific transmit and receive filters, using series and shunt switches with varying stack numbers to manage voltage and reduce terminal count, thereby minimizing signal distortion and footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single switch circuit is used to connect multiple duplexers for simultaneous signal transmission, then the number of transmission paths increases, but the number of terminals in the switch circuit increases and the voltage applied to terminals increases, causing signal distortion
Solution Approach 1:
The single switch circuit is divided into multiple switch circuits (first switch circuit, second switch circuit, third switch circuit), each handling specific transmission paths. This segmentation reduces the number of terminals per switch circuit and lowers the voltage stress on individual terminals, thereby reducing signal distortion while maintaining multiple transmission paths capability
2Productivity
If a single switch circuit handles multiple transmit signals simultaneously, then multiple signals can be transmitted, but the voltages applied to terminals increase, generating signal distortion
Solution Approach 1:
Multiple switch circuits are used to segment the simultaneous signal transmission task. Each switch circuit handles specific signal paths with reduced voltage requirements, preventing the voltage accumulation and signal distortion that would occur in a single switch circuit handling all signals
3Manufacturing precision
If a switch circuit with high withstand voltage is used to handle increased voltages, then signal distortion is reduced, but the footprint of the switch circuit increases
Solution Approach 1:
Instead of using a single high-withstand-voltage switch circuit with large footprint, the system segments the function into multiple switch circuits with lower individual voltage requirements. Each smaller switch circuit has a reduced footprint, and their combined area is smaller than a single large switch circuit would require
Solution Approach 2:
The voltage parameter distribution is changed from concentrated high voltage in one switch circuit to distributed lower voltages across multiple switch circuits. This parameter change allows using smaller, more compact switch circuits while maintaining signal quality
Data Source
AI summary
A radio frequency circuit includes a transmit filter for B66-Tx connected to a power amplifier, a transmit filter for B25-Tx connected to a power amplifier, a switch circuit having terminals, a switch circuit having a common terminal and terminals, and a switch circuit having a common terminal and terminals. The terminal is connected to the common terminal, the terminal is connected to the common terminal, the terminal is connected to the transmit filter, and the terminal is connected to the transmit filter. The switch circuit has a smaller stack number than the switch circuit, and the switch circuit has a smaller stack number than the switch circuit.