Multiband Power Amplifier Circuit With Resonant Switch Bypass
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Power amplification circuits in multiband wireless communication devices experience signal power loss and distortion due to the high electrical power handling requirements of switches used in the output-side switching mechanism.
Innovation Solution
A power amplification circuit design that employs two LC parallel resonant circuits, each with a switch, where the switches are controlled to allow transmission signals of different frequencies to bypass the main line with a switch, reducing power loss and distortion by using the capacitors as main lines for signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switch is incorporated into the main line through which a transmission signal passes, then signal routing between multiple frequency bands is enabled, but power loss occurs in the switch and signal distortion occurs due to large power input
Solution Approach 1:
The circuit is divided into a main line that does not contain switches and separate branched lines that contain switches. The transmission signal passes through the switch-free main line, while the switches in the branched lines control frequency-selective paths. This segmentation allows signal routing functionality while eliminating power loss and distortion in the main signal path.
Solution Approach 2:
LC parallel resonant circuits are introduced as intermediary elements in the branched lines. These resonant circuits act as frequency-selective mediators that work with the switches to route different frequency bands through different paths, enabling adaptability without requiring the main line switch to handle all frequency routing directly.
2Adaptability or versatility
If a switch is incorporated into the main line through which a transmission signal passes, then signal routing between multiple frequency bands is enabled, but the switch is required to have high electrical power handling capability
Solution Approach 1:
By segmenting the circuit into a main line without switches and branched lines with switches, the power handling requirement is transferred from the main line to the branched line switches. These switches only need to handle the power in their respective frequency-selective paths rather than the full transmission power, reducing the required electrical power handling capability.
Solution Approach 2:
The LC parallel resonant circuits serve as intermediaries that isolate the main transmission line from the switching operations. The resonant circuits filter specific frequency bands and direct them through switches in the branched lines, allowing the main line to remain free of switches and their associated power handling requirements.
3Loss of energy
If multiple LC parallel resonant circuits with switches are connected in parallel, then frequency-selective signal routing is achieved without power loss in the main line, but the number of circuit components increases
Solution Approach 1:
Multiple LC parallel resonant circuits are connected in parallel configuration, merging their frequency-selective functions into a single circuit structure. This parallel arrangement allows different frequency bands to be routed simultaneously through different branched lines without requiring separate sequential circuits, reducing overall complexity while maintaining energy efficiency.
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
Significantly reduces power loss and signal distortion, eliminating the need for high power handling capabilities in switches and minimizing circuit components, thereby reducing costs and size.
Implementation Method 1
a first LC parallel resonant circuit whose resonant frequency is set to the first frequency and a second LC parallel resonant circuit whose resonant frequency is set to the second frequency
Data Source
AI summary
A power amplification circuit amplifies and then outputs transmission signals of a first frequency and a second frequency, which are different from each other. When the transmission signal of the first frequency is input, a first switch is turned ON, a first LC parallel resonant circuit enters a resonant state and the transmission signal is transmitted using a line containing a first capacitor as a main line. When the transmission signal of the second frequency is input, a second switch is turned ON, a second LC parallel resonant circuit enters a resonant state and the transmission signal is transmitted using a line containing a second capacitor as a main line. Therefore, a transmission signal does not pass through, using as a main line, a line into which a switch has been incorporated.