Multi-Band RF Circuit With Switchable Spur Attenuation
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Solution Overview
Problem
The use of high power class in simultaneous communication of multiple bands degrades the quality of signals in current radio-frequency circuits.
Innovation Solution
A radio-frequency circuit design incorporating a first power amplifier supporting a high power class, filters, an attenuation circuit, and a switch, which allows for simultaneous communication of multiple bands while minimizing signal degradation by attenuating spurious components using an inductor and switch configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power class is used in simultaneous communication of multiple bands, then output power is increased, but signal quality is degraded
Solution Approach 1:
The patent divides the signal processing path into separate transmit paths for different bands (first transmit path for first band, second transmit path for second band). Each path has its own power amplifier and filter, allowing independent optimization. The attenuation circuit is selectively applied to specific paths based on communication mode, segmenting the harmful high-power effects from the paths that need quality protection.
Solution Approach 2:
The patent dynamically configures the attenuation circuit based on communication mode. A switch controls whether the attenuation circuit is connected to the transmit path depending on whether simultaneous communication of multiple bands is being performed. This dynamic adjustment allows the system to optimize for either power output or signal quality based on current operational requirements.
2Reliability
If attenuation circuit is always connected, then signal quality is improved, but device complexity increases
Solution Approach 1:
The attenuation circuit is made dynamically controllable through a switch that connects or disconnects it based on communication mode. This dynamic configuration allows the system to only engage the attenuation circuit when needed (during simultaneous multi-band communication), avoiding unnecessary complexity in the circuit design while maintaining signal quality when required.
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 design reduces signal degradation and maintains signal quality during high power class simultaneous communication of multiple bands by attenuating spurious components, thereby improving electrical characteristics.
Implementation Method 1
The attenuation circuit has an attenuation band including at least part of the second band and includes an inductor connected between the transmit path and the ground
Data Source
AI summary
A radio-frequency circuit includes a first power amplifier, first and second filters, an attenuation circuit, and a switch. The first power amplifier supports a first power class which allows for maximum output power higher than power class 3. The first filter has a pass band including a first band and is connected between the first power amplifier and an antenna connecting terminal. The second filter has a pass band including a second band and is connected to the antenna connecting terminal. The radio-frequency circuit can perform simultaneous communication of the first band and the second band. The attenuation circuit and the switch are connected in series with each other between a ground and a transmit path connecting the first power amplifier and the antenna connecting terminal.